Implement expressions2 package #3611

Job	Run time
Prepare CodeQL unit test matrix	5s
Run unit tests (c, 2.19.4, codeql-cli/v2.19.4, codeql-bundle-v2.19.4, ubuntu-latest-xl, codeql-cl...	3m 0s
Run unit tests (cpp, 2.19.4, codeql-cli/v2.19.4, codeql-bundle-v2.19.4, ubuntu-latest-xl, codeql-...	1h 19m 28s
Validate test results	3s
	1h 22m 36s

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