Add weeks and expand on tests for Tagalog locale

[krisfremen]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• 🧪 Added tests for changed code.
• 🛠️ All tests pass when run locally (run tox or make test to find out!).
• 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• 📚 Updated documentation for changed code.
• ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

This adds weeks and meridians to Tagalog.
Along with a full battery of tests.

[codecov]

Codecov Report

Merging #849 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #849   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         1785      1786    +1     
  Branches       307       307           
=========================================
+ Hits          1785      1786    +1     

Impacted Files	Coverage Δ
arrow/locales.py	100.00% <100.00%> (ø)

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[systemcatch]

I can't comment on the translations but I'm loving the extensive tests!

[jadchaar]

Solid. Like Chris said, nice test additions.