refactor: Json to proto message refactoring (#2085)

* refactor: Capitalize deep constants in JsonToProtoMessage and make them final

* refactor: Extract magic variables to constants

* refactor: Remove topLevel parameter from JsonToProtoMessage methods

* refactor: Remove unnecessary variables "message" from JsonToProtoMessage methods

* refactor: Remove unnecessary casts from JsonToProtoMessage methods and remove usage of soon deprecated (Java 9) Long constructor

* refactor: Remove unnecessary LOG field from JsonToProtoMessage

* refactor: Properly reference to static field INSTANCE in JsonToProtoMessage

* refactor: Use enhanced for in JsonToProtoMessage

* refactor: Use equalsIgnoreCase for JSON string boolean values in JsonToProtoMessage and use primitives for booleans

* refactor: Replace fail variable with failure extracted to method in JsonToProtoMessage repeated fields.

* refactor: Inline json scope variable and ignoreUnknownFields variable in JsonToProtoMessage

* 🦉 Updates from OwlBot post-processor

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README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-bigquerystorage'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-bigquerystorage:2.36.0'
+implementation 'com.google.cloud:google-cloud-bigquerystorage:2.36.1'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "2.36.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "2.36.1"
 ```
 <!-- {x-version-update-end} -->
 
@@ -220,7 +220,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-bigquerystorage/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-bigquerystorage.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquerystorage/2.36.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquerystorage/2.36.1
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles