feat: align, rather than indent, error causes

[ghost]

Description

Rather than increasing indentation, dfx now displays each error cause on its own line.

Also changed error types to report error causes as causes, rather than embedding their error cause in the error text.

Before:

Error: Failed while trying to deploy canisters.
Caused by: Failed while trying to deploy canisters.
  Failed to build all canisters.
    Failed while trying to build all canisters.
      The build step failed for canister 'bw4dl-smaaa-aaaaa-qaacq-cai' (wasminst_backend) with an embedded error: Failed to build Motoko canister 'wasminst_backend'.: Failed to compile Motoko.: Failed to run 'moc'.: The command '"/Users/ericswanson/.cache/dfinity/versions/0.19.0/moc" ... params ...  failed with exit status 'exit status: 1'.
Stdout:

Stderr:
/Users/ericswanson/w/wasminst/src/wasminst_backend/main2.mo: No such file or directory

After:

Error: Failed while trying to deploy canisters.
Caused by: Failed to build all canisters.
Caused by: Failed while trying to build all canisters.
Caused by: The build step failed for canister 'bw4dl-smaaa-aaaaa-qaacq-cai' (wasminst_backend)
Caused by: Failed to build Motoko canister 'wasminst_backend'.
Caused by: Failed to compile Motoko.
Caused by: Failed to run 'moc'.
Caused by: The command '"/Users/ericswanson/.cache/dfinity/versions/0.20.0/moc" ... params ... failed with exit status 'exit status: 1'.
Stdout:

Stderr:
/Users/ericswanson/w/wasminst/src/wasminst_backend/main2.mo: No such file or directory

How Has This Been Tested?

..

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.