Don't use lambda to provider compiler arguments

[pkoenig10]

#1752 broke the Immutables incremental compilation because the compile argument provider is a lambda. Because lambda class names are not stable, Gradle can't cache the results of the compile task.

Caching disabled for task ':compileJava' because:
  Non-cacheable inputs: property 'options.compilerArgumentProviders.$2' was implemented by the Java lambda 'com.palantir.baseline.plugins.BaselineImmutables$$Lambda$16803/0x0000000801da7c58'. Using Java lambdas is not supported, use an (anonymous) inner class instead.
Task ':compileJava' is not up-to-date because:
  Implementation of input property 'options.compilerArgumentProviders.$2' has changed for task ':compileJava'
The input changes require a full rebuild for incremental task ':compileJava'.
Full recompilation is required because no incremental change information is available. This is usually caused by clean builds or changing compiler arguments.

See https://docs.gradle.org/current/userguide/more_about_tasks.html#sec:how_does_it_work.

[pkoenig10]

I've verified locally that this fixes the issue.

[svc-autorelease]

Released 3.82.0

[CRogers]

Oof - we definitely need to add these to the error prone check

[CRogers]

Error prone to stop that happening again: #1757