Add spring-javaformat checkstyle and formatting

https://github.com/spring-io/spring-javaformat/ provides checkstyle and automatic source formatting for Spring Project. This issue is to discuss how it might be applied to spring-security.

Remove "need braces" checkstyle suppression

Reduce the number of nested if statements

Ensure all files end with a new line

Ensure no whitespace before lines

Ensure classes are defined in their own files

Fix parenthesis padding issues

Remove "redundant import" checkstyle suppression

Migrate SwitchUserWebFilterTests AssertJ

Migrate to BDD Mockito

Simplify boolean expression

Simplify boolean returns

Remove restricted static imports

Update exception variable names

Remove superfluous comments

Closing in favor of gh-8946

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