Add support for Gradle 7 projects

[baksansk]

Issue #, if available:
#360

Description of changes:

Task

In Gradle 7, build fails because private fields are annotated with @Internal but don't have any getters.

Solution

Add getters and setters to the fields marked with @Internal.
This is consistent with other fields marked as @Internal in ApolloClassGenTask

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[IgorCordasEndava]

I was trying to fix this by having a custom build of the plugin but it got too complicated to build it along with the project.
Your changes look good and they would fix the issue.

We would love to have this be available ASAP in the original plugin and in the repo, since this is becoming a blocker for our project.

[TomBell-Trove]

Bump for whoever is maintaining this. We need you!

[HarrisonSeidel]

This is holding us up being able to use Jetpack Compose, we would love if it could be merged 🙏

[lolucosmin]

Hi, same thing here, we need this ASAP.

[thegamer123]

please , we need this update soo urgent , can you push the fix

[jimmyhoran]

+1, would love to this merged in and a release made. This is a big blocker for us.

[TomBell-Trove]

🙇

[somq]

Any release planned @rjuliano?
Waiting on this one to bump our gradle version

[somq]

I don't want to be harsh, but come on... We are all using a commercial solution here and we depend on these SDKs.
I'm aware that maintainers have a schedule forced by the time they can affect to the project but generally speaking AWS need to be wayyy more reactive, especially concerning these blocking updates.

[poojamat]

LGTM

[mukovozov]

+1, for me this is really a blocker, a new version of the navigation component, which added fixes for push notifications on android 12, only works with gradle 7.

[baksansk]

@mukovozov My PR doesn't fix Gradle 7 compatibility. I'm having another error at compile time and I'm working on another patch to compile on Gradle 7.

[itslonua]

Execution failed for task ':app:nodeSetup'.

Build was configured to prefer settings repositories over project repositories but repository 'ivy' was added by unknown code

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