Fix array type parsing in generic types

[MartinGC94]

PR Summary

Fixes the generic type argument parsing so array types don't need additional brackets to be parsed correctly.
So now this: [System.Tuple[System.String[],System.Int32[]]] works like you would expect.
The issue was caused by the parser looking for an assembly qualified name if a comma appeared after an array type, but that's not valid inside unbracketed generic type arguments so a check has been added for that.

PR Context

Fixes #18686
Fixes #9639

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This PR has 14 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +10 -4
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Total files changed: 2

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.cs : +4 -4
.ps1 : +6 -0

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[iSazonov]

@daxian-dbw @SeeminglyScience Friendly ping.

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This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
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[daxian-dbw]

LGTM

[daxian-dbw]

Thanks @MartinGC94 for the contribution!

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🎉v7.4.0-preview.4 has been released which incorporates this pull request.:tada:

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