respect text encoding specified in argument (#20795)

[ryohji]

If explicitly specified, respect encoding parameter of AioHttpTransportResponse#text method to resolve the issue #20795.

[ghost]

Thank you for your contribution ryohji! We will review the pull request and get back to you soon.

[xiangyan99]

Thank you for the contributing. We are reviewing the change and will keep you updated.

[xiangyan99]

Why you put if encoding in if not encoding: statement?

[ryohji]

This is original implementation's L.317.
On original L.316, the method overwrites encoding if it explicitly specified by callers. (And it might be None; this is the reason why this if encoding: lives in if not encoding: statement)
I thought that original L.313 to L.336 is the guard for encoding = None so just add L.313 if not encoding: and indented following lines.

But reviewing my own code, this None check might be enough just before original L.316.
So I re-write patch and force-pushed it.

Thanks to your review!

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[ryohji]

/check-enforcer override

[ryohji]

/check-enforcer evaluate

[ryohji]

/check-enforcer reset

[ryohji]

/check-enforcer evaluate

[xiangyan99]

Thanks for the contribution.

If you don't mind, I will close this one and use #20999 to track.

[ryohji]

OK, I agreed.

Thanks to your review.