Version 9.0.0 (#127)
* Updated for v9.0.0
* Updated CHANGELOG.md
* Updated @testable import statement
* Updated README.md
* Removed superseded files
* Conform SalesforceError to LocalizedError
* Updated errorDescription for SalesforceError
* Default API version to 51.0
* Made Record subscript public
* Added documentation
* Updated documentation
* Made query methods generic
* Generic retrieve method
* Added non-generic version of ConnectedApp.retrieve
* Updated tests for generic methods
* Updated test
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* Updated release date in change log
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