chore(grpc-transcode): allow an array type of `request_table` passed in `map_message` method

[Jadesource]

1.fix object array lost

Description

Fixes # (issue)

Checklist

• [ ] I have explained the need for this PR and the problem it solves
• [ ] I have explained the changes or the new features added to this PR
• [ ] I have added tests corresponding to this change
• [ ] I have updated the documentation to reflect this change
• [ ] I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[tokers]

@Jadesource Please check out the CI jobs (the code lint was failed).

[nic-chen]

hi @Jadesource Could you add some test cases for the change? Make sure it works well. Thanks!

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[github-actions[bot]]

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