feat(locale): add cy locale, start with date

[Awen23]

Add Welsh locale, start with date module

I've got some other modules ready/in progress, but it looks like one module at a time is the preferred way so starting with just date

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (b2c5298) to head (6f3c43f).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3462   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files        2830     2836    +6     
  Lines      218533   218603   +70     
  Branches      951      952    +1     
=======================================
+ Hits       218480   218550   +70     
  Misses         53       53           

Files with missing lines	Coverage Δ
src/locale/cy.ts	100.00% <100.00%> (ø)
src/locale/index.ts	100.00% <100.00%> (ø)
src/locales/cy/date/index.ts	100.00% <100.00%> (ø)
src/locales/cy/date/month.ts	100.00% <100.00%> (ø)
src/locales/cy/date/weekday.ts	100.00% <100.00%> (ø)
src/locales/cy/index.ts	100.00% <100.00%> (ø)
src/locales/cy/metadata.ts	100.00% <100.00%> (ø)
src/locales/index.ts	100.00% <100.00%> (ø)

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[xDivisionByZerox]

Thank you for your contribution @Awen23 ❤️👏

I see that this was your first contribution to our project.
Would you mind answering some questions regarding your contribution? This way we can understand the potential struggles or confusions new contributors might have when getting into the project. If you don't want to answer, please ignore this comment:

1. What did motivate you to do your contribution?
2. Did you read our documentation regarding contributing before starting to work on your contribution?
3. How clear was the process of working on your contribution (before the PR) for you? Was there ever a time while working in the project where you didn't know what to do? If so how did you solve your problem?
4. How clear was the process of the code review (PR) for you? Was there ever a time you felt unsure about the current situation?
5. Anything else you'd like to share with the Faker team?