[feat] Adds helpers to convert js lists to a dart list (Resolves #281)

[rutvik110]

[feat] Adds a helpers to convert js list to a dart list (Resolves #281)

Updates:

• Converted TouchListWrapper to JSListWrapper which is a generic wrapper to work with different types of js list.

• Updates TouchListConvert to use JSListWrapper.

• Added two new helpers, HTMLCollectionConvert on HTMLCollection and NodeListConvert on NodeList to convert js list to a dart list.

• [x] I’ve reviewed the contributor guide and applied the relevant portions to this PR.

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[rutvik110]

@srujzs

[kevmoo]

Awesome, @rutvik110 – we'll want a changelog entry here, too!

[srujzs]

Thanks for taking this on again, very much appreciated! +1 to changelog entry (especially if we deprecate some of these members). FYI, analysis is complaining about formatting so I'd run dart format on these changes.

It might also be worth adding a test for this (we can just test using the list wrapper for HTMLCollection or something).

[rutvik110]

@srujzs Changelog added.

[srujzs]

LGTM, let's merge it! The analysis issues are unrelated and I'm working on fixing that.