feat(developer): kmc-convert: create a seperate util module for kmc-convert 😎

[SabineSIL]

While developing kmc-convert a new set of functions have been added

• Those should be moved to their own module.
• Tests should also be added for all those functions

see requests:

• JavaScript identifiers,

• use regex

• use regex

• use regex

• replace substring()

• Intl.Segmenter()

• replace indexOf()

@keymanapp-test-bot skip

see PR #12564
see PR #14666

[keymanapp-test-bot]

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