DATAJDBC-397 - Experimental support for SpEL inside @Query annotations.

[schakko]

This PR tries to add experimental support to Spring Data JDBC. I've been able to use this PR with Spring Security, As described in https://spring.io/blog/2014/07/15/spel-support-in-spring-data-jpa-query-definitions you can now use something like

interface PersonRepository extends PagingAndSortingRepository<Person, String> {
  @Query("SELECT * FROM person WHERE username = :#{ principal?.username }")
  Person findActiveUser();	
}

Some things I like to discuss, because I don't want to do any stupid things here:

• As I've already mentioned to @schauder on Twitter, this is a working prototype. I am pretty sure that there are too many corner cases I haven't think of or parts I am still lacking the understanding of :-(
• Please let me know if I am misinterpreting the Contribution guidelines regarding the JavaDoc @author tag; I don't want to take credit for something I haven't contributed for.
• ParameterBindings and ParameterBindingParser come from the Spring Data JPA project. At the moment they are both copy&pasted from SD-JPA and have public access modifiers. Both classes should probably be moved to Spring Data Commons.

Thank you for taking the time to look into this PR!

[dling]

Would really like to see SpEL support on Query-annotation here. Can this PR be finalized as is ?

[schauder]

I rebased this, applied Marks comments and merged it with main. Thanks for this PR.

[peteraramaldes]

@schauder This change is in which version? 3.0.1?

[schauder]

@peteraramaldes This went into 3.0.0-RC1. It is therefore part of all 3.x releases after that including the 3.0.0 GA release.