feat(ci): add `npm` caching in CI

[SauravMaheshkar]

Changes made by this PR can be summarized as follows:

• Set the cache and cache-dependency-path argument to enable caching to speed up CI times.

[coveralls]

Pull Request Test Coverage Report for Build 4712907569

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 44.741%

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Totals
Change from base Build 4708608852:	0.0%
Covered Lines:	254
Relevant Lines:	514

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💛 - Coveralls