feat(@formatjs/icu-messageformat-parser): preprocess 'j' date time skeleton before parsing as suggested in the Unicode guide

[batjaa]

• Preprocess 'j' date time skeleton before parsing as suggested in the Unicode guide
• Add unit tests & tests for intl-messageformat for date time skeleton 'j' patterns

[batjaa]

@longlho would you approve the tests/builds?

[batjaa]

Fixed broken build:

• IDE automatically formatted some part of snapshot file
• Run prettier to fix styling issues

@longlho if you can approve for builds again. Do I need to request building everytime I make a change?

[longlho]

Unfortunately yeah because it's your first PR

[batjaa]

Got it. All good, just wanted to confirm.

• Fix unit tests :duh:

[longlho]

Thanks a lot for your contributions!

[batjaa]

👍 I'll try to contribute more as time allows.