fixes customizer logic in the GsonGrpcJsonMarshallerBuilder

[AnyRoad]

Motivation:

• JsonFormat.Parser and JsonFormat.Printer classes are immutable and call of any method in customizer of the GsonGrpcJsonMarshallerBuilder creates new object.
• Because of that result of the customer is ignored so we need a way to use new object created in the customizer.

Modifications:

• Replaces Consumer which does not return anything with the Function<T, T> customizer which returns customized object.

Result:

• We can actually customize JsonFormat.Parser and JsonFormat.Printer using the customizer object.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

🔍 Build Scan® (commit: b4d95b5)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/ekdn5o7flgz3m
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/2pubauo7nulok
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/vaziodhhu33ja
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/wibz4afpge2u2
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/k3dvwyrlc7mto
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/hh5h4erx2gwky
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/3frto5gdjkkkm

[minwoox]

Hi, @AnyRoad! Thanks for the PR!
Would you mind:

• Signing CLA
• Adding test cases that verities the differences?
• Adding a new method instead of changing the signature of the existing method which breaks the compatibility?

[AnyRoad]

Hi, @AnyRoad! Thanks for the PR! Would you mind:

* Signing CLA

* Adding test cases that verities the differences?

* Adding a new method instead of changing the signature of the existing method which breaks the compatibility?

Hi @minwoox !
I've signed the CLA, added unit tests and reverted back the original methods. Since they do not work properly I've marked them as deprecated.

[trustin]

Thanks a lot, @AnyRoad! Left a couple minor comments about logging.

[trustin]

Nice work! Thank you! 🙇

[minwoox]

Thanks! @AnyRoad 👍 👍 👍