Implement package expressions2 #4190

Job	Run time
Prepare CodeQL unit test matrix	5s
Run unit tests (c, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-cl...	39m 5s
Run unit tests (cpp, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-...	1h 59m 14s
Validate test results	7s
	2h 38m 31s

Provide feedback