Bugfix/number literal format fix

[rgant]

PR checklist

• Fixes number-literal-format fix strips significant zeros #4855
• bugfix
  • Includes tests

Overview of change:

The fixer for number-literal-format did not preserve significant zeros in the number. Changed the RegEx so it would better match decimals with leading and internal zeros as they are significant. Still trims trailing (insignificant) zeros.

Is there anything you'd like reviewers to focus on?

For some reason I had to add two blank lines to the end of test/rules/number-literal-format/test.ts.fix I cannot see why that happened.

CHANGELOG.md entry:

[bugfix] Preserve significant zeros in fixer for number-literal-format

[palantirtech]

Thanks for your interest in palantir/tslint, @rgant! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[JoshuaKGoldberg]

Love it, thanks @rgant!

[rgant]

I signed it.