* Run Psalm on src as well as Static Analysis Fixture
Psalm baselining feature is used to prevent immediate build failures -
psalm will just cause failures for errors caused by future changes to
the code.
See https://psalm.dev/docs/running_psalm/dealing_with_code_issues/#using-a-baseline-file
* Fix MixedArgument issues in OrderedTimeCodec
Potentially unpack should be documented as returning string[] instead of
array to make this unecassary.
* Fix Psalm PossiblyNullPropertyAssignmentValue issues
* Add psalm-immutable annotation to Uuid class
* Fix Psalm MixedArgument issues
* Fix MissingImmutableAnnotation psalm issue
* Fix Psalm MixedAssignment issue
* Fix Psalm InvalidReturnStatement / InvalidReturnType issue
* Add ImpureMethodCall issues to baseline.
Fixing these in one place just moves them somewhere else.
* Exclude psalm-baseline.xml from exported git archives
Ben Ramsey
Barney Laurance