Make quote character in `@CsvSource` and `@CsvFileSource` configurable

[sbrannen]

Overview

In order to treat text blocks as files in @CsvSource (see #2734), we should allow users to change the quote character to " when using text blocks.

This will of course allow one to change the quote character to anything other than ' or ", even when using the value attribute in @CsvSource, but it is assumed the primary use case is using double quotes in text blocks.

For consistency in supported features, we should do the same for @CsvFileSource.

Related Issues

• Introduce support for text blocks in @CsvSource #2721
• Treat text blocks as files in @CsvSource #2734

Deliverables

• Introduce new char quoteCharacter() default '\''; attribute in @CsvSource.
• Introduce new char quoteCharacter() default '"'; attribute in @CsvFileSource.
• Document in the Release Notes.

[sbrannen]

Current work on this issue can be viewed in the following feature branch:

main...sbrannen:issues/2735-make-quote-character-in-CsvSource-configurable