feat(datepicker): added Lithuanian locale support for datepicker

[kiloPause]

PR Checklist

Before creating new PR, please take a look at checklist below to make sure that you've done everything that needs to be done before we can merge it.

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #4787 into development will decrease coverage by <.01%.
The diff coverage is 72.22%.

@@               Coverage Diff               @@
##           development    #4787      +/-   ##
===============================================
- Coverage        74.46%   74.45%   -0.01%     
===============================================
  Files              203      204       +1     
  Lines             7150     7168      +18     
  Branches          1448     1457       +9     
===============================================
+ Hits              5324     5337      +13     
- Misses            1430     1432       +2     
- Partials           396      399       +3

Impacted Files	Coverage Δ
src/chronos/public_api.ts	100% <100%> (ø)	⬆️
src/chronos/i18n/lt.ts	70.58% <70.58%> (ø)

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[ludmilanesvitiy]

Tested Datepicker demo with the new locale in Chrome, FF. Looks good. Tests passed, build success.