Doc: update the NOTICE and LICENSE files

Before donating Cloudberry to the Apache Incubator, we made some
adjustments to LICENSE and NOTICE files, as reflected in the git blame
history. However, those changes introduced unnecessary entries that
didn't fully align with Apache guidelines. This commit refines these
files to better comply with Apache standards and reflects the latest
changes in the project source code.

The COPYRIGHT file, inherited from the PostgreSQL upstream, served a
similar purpose as the NOTICE file. As it is redundant, it has been
removed from this commit.

And introducing one new dir named `licenses` for a clearer licenses
management.

Author: tuhaihe

COPYRIGHT

@@ -198,4 +198,141 @@
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
+   limitations under the License.
+
+================================================================================
+This product includes software from PostgreSQL, under the PostgreSQL License:
+
+   see licenses/LICENSE-postgresql.txt
+
+The PostgreSQL software includes:
+
+----------------------------
+   BSD License
+      
+      src/bin/pg_controldata/pg_controldata.c
+      copyright (c) Oliver Elphick <olly@lfix.co.uk>, 2001
+
+----------------------------
+   BSD-4-Clause (University of California-Specific)
+      
+      src/include/port/win32_msvc/glob.h
+      src/port/glob.c
+
+      see licenses/LICENSE-glob.txt
+
+----------------------------
+   BSD 3 Clause License
+      
+      src/port/inet_aton.c
+      see licenses/LICENSE-bsd3-inet_aton.txt
+      
+      src/port/snprintf.c
+      see licenses/LICENSE-bsd3-snprintf.txt
+      
+      src/backend/utils/mb/wstrcmp.c
+      see licenses/LICENSE-bsd3-wstrcmp.txt
+      
+      src/backend/utils/mb/wstrncmp.c
+      see licenses/LICENSE-bsd3-wstrncmp.txt
+      
+      src/backend/libpq/sha2.h
+      see licenses/LICENSE-bsd3-sha2.txt
+
+----------------------------
+   Internet Systems Consortium/Internet Software Consortium (ISC) LICENSE
+      
+      src/port/strlcpy.c
+      see licenses/LICENSE-strlcpy.txt
+      
+      src/backend/utils/adt/inet_cidr_ntop.c
+      src/backend/utils/adt/inet_net_pton.c
+      see licenses/licenses/LICENSE-isc.txt
+
+----------------------------
+   Perl Artistic License 2.0 (exception)
+      
+      src/pl/plperl/ppport.h: 
+
+      Pursuant to https://issues.apache.org/jira/browse/LEGAL-79 and
+      PL/Perl's use of a generated header file, we declare this file to
+      be an exception to the Perl Artistic License.  This file is
+      derived from the PostgreSQL code base.
+  
+      For completeness sake, we have provided the Perl Artistic License
+      for the Perl Devel-PPPort module
+      (http://search.cpan.org/~wolfsage/Devel-PPPort-3.32/PPPort.pm).
+      This module was used to generate the src/pl/plperl/ppport.h header
+      file. The license is available:
+  
+      see licenses/LICENSE-ppport.txt
+
+----------------------------
+   test-ctype LICENSE
+
+      src/test/locale/test-ctype.c
+  
+      see licenses/LICENSE-test-ctype.txt
+
+----------------------------
+   regex LICENSE
+      
+      src/backend/regex 
+  
+      see licenses/LICENSE-regex.txt
+
+----------------------------
+   PostgreSQL-style License
+
+      src/port/gettimeofday.c 
+  
+      see licenses/LICENSE-gettimeofday.txt
+
+================================================================================
+This product contains significant parts that were originally based on software
+from VMware, Inc. or its affiliates.
+
+Greenplum Database
+
+Copyright (c) 2004-2020 VMware, Inc. or its affiliates. All Rights Reserved.
+
+All Rights Reserved.
+
+Greenplum Database is licensed under the Apache License Version 2.0
+(see LICENSE & NOTICE) and is based on the PostgreSQL Database
+Management System.
+
+The Greenplum Database software includes:
+
+----------------------------
+   Stream License
+
+      gpMgmt/bin/stream/*
+
+      see licenses/LICENSE-stream.txt
+
+----------------------------
+   0-clause license ("Zero Clause BSD")
+
+      gpcontrib/orafce/*
+
+      see licenses/LICENSE-orafce.txt
+
+================================================================================
+PostgreSQL-style license
+
+   gpMgmt/bin/pythonSrc/PyGreSQL-4.0: 
+
+   see licenses/LICENSE-pygresql.txt
+
+================================================================================
+This product includes code from pg_cron under PostgreSQL license:
+
+   /src/include/task/pg_cron.h
+   /src/include/task/task_states.h
+   /src/include/task/job_metadata.h
+   /src/backend/task/task_states.c
+   /src/backend/task/job_metadata.c
+   /src/backend/task/pg_cron.c
+
+   see licenses/LICENSE-citusdata.txt