[java] several packages marks jspecify nullmarked (#16802)

* [refactor] add NullMarked annotation to Chromium package and update log level handling

* [refactor] add @Nullable annotations to various classes and create package-info.java for devtools

* refactor: remove @NullMarked annotations from several classes and add package-info.java for nullability specification

* refactor: remove @NullMarked annotations from multiple classes in selenium package

* refactor: remove @NullMarked annotation from By.java and update formatting in ConverterFunctions.java

* refactor: add jspecify artifact dependency to devtools and javadoc BUILD files

* replaces @NullMarked annotation to package-info.java files in chromium, devtools, and selenium packages after review

* Revert "replace @NullMarked annotation to package-info.java files in chromium, devtools, and selenium packages after review"

This reverts commit 52ad8fea46e068fa3ed7a0428bf2d58cc29d2218.