Add ability to deepMerge arrays

[chambo-e]

Hello, just crossed a tiny bug when trying to extend the context defined in the config with a jestPlaywright.resetContext

My configuration storageState was overwriten by the newContext while it should have been merged :)

[mmarkelov]

@chambo-e lgtm for me.
@mxschmitt by the way i think about replacing custom deepMerge function with deepmerge. What do you think?

[mxschmitt]

@chambo-e lgtm for me.
@mxschmitt by the way i think about replacing custom deepMerge function with deepmerge. What do you think?

makes sense!

[chambo-e]

@chambo-e lgtm for me.
@mxschmitt by the way i think about replacing custom deepMerge function with deepmerge. What do you think?

makes sense!

I can include it in this PR if you want

[mmarkelov]

@chambo-e I think that replacing custom deepMerge should be done in separate PR

[chambo-e]

@mmarkelov alright, I'll open another PR once this one is merged :)

I'v corrected the tests by spreading DEFAULT_CONFIG instead of deepMerge-ing it with other configurations. As DEFAULT_CONFIG only has top level keys I don't think there will be any issues.
Let me know if you want to try another approach

[coveralls]

Pull Request Test Coverage Report for Build 793505385

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-1.01%) to 94.798%

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Files with Coverage Reduction	New Missed Lines	%
src/utils.ts	1	94.41%

Totals
Change from base Build 784546029:	-1.01%
Covered Lines:	106
Relevant Lines:	109

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💛 - Coveralls

[mmarkelov]

@chambo-e sorry for late response. Seems ok for me. @mxschmitt i suppose we can merge it. What do you think?