* Adds Error Prone to the `pom.xml`
* Adds Error Prone annotations to avoid compiling errors
* Adds profile to run Error Prone in JDK8
* Revert "Adds profile to run Error Prone in JDK8"
This reverts commit 61771d0da55003ea5bc8c6f086d925aec583c9a2.
* Fix Error Prone warn
* Add comment to `pom.xml`
* Fix the `@SuppressWarnings("GetClassOnClass")`
* Replace the Error Prone link in the `pom.xml`
* Disable Error Prone with jdk-15`
* Remove a new-line in `pom.xml`
* Port Junit assert to Truth in `com.google.gson.stream`
* Port Junit assert to Truth in `com.google.gson.regression`
* Port Junit assert to Truth in `om.google.gson.reflect`
* Port Junit assert to Truth in `com.google.gson.metrics`
* Port Junit assert to Truth in `com.google.gson.internal`
* Port Junit assert to Truth in `com.google.gson.internal.sql`
* Port Junit assert to Truth in `com.google.gson.internal.reflect`
* Port Junit assert to Truth in `com.google.gson.internal.bind`
* Port Junit assert to Truth in `com.google.gson.internal.bind.util`
* Port Junit assert to Truth in `com.google.gson.functional`
* Replaces `List.of` with `Arrays.asList` to grant legacy
* Simplify `==` asserts
* Simplify `.contain()` asserts + Minor fixes
* Simplify asserts
