Zeekscript

* Add required version to pyproject.toml (Benjamin Bannier, Corelight)

* Drop unsupported macos-10.15 runner, add macos-12 (Benjamin Bannier, Corelight)

* Fix formatting of index slices (Benjamin Bannier, Corelight)

* Drop manually implemented test runner in favor of pytest. (Benjamin Bannier, Corelight)

* Use testutils-provided `zeekscript` import in tests (Benjamin Bannier, Corelight)

* Refactor tests to use common infrastructure (Christian Kreibich, Corelight)

* Start test cases for the zeekscript.Script class. (Christian Kreibich, Corelight)

* Support text and binary output in zeekscript.Script.write_tree(). (Christian Kreibich, Corelight)

* Avoid trailing whitespace in "zeek-script parse" output. (Christian Kreibich, Corelight)

* Fix black's code formatting that broke f-strings in parse tree output (Christian Kreibich, Corelight)

* Drop unsupported macos-10.15 runner, add macos-12 (Benjamin Bannier, Corelight)

* Remove pylint from CI requirements and README (Christian Kreibich and Benjamin Bannier, Corelight)

* Remove the existing pylint testcase, since pre-commit now covers pylint. (Christian Kreibich, Corelight)

* Run all pylint checkers for pre-commit hook (Benjamin Bannier, Corelight)

* Add pre-commit hook for running pylint (Benjamin Bannier, Corelight)

* Automatically upgrade Python sources with pyupgrade (Benjamin Bannier, Corelight)

* Add pre-commit hook for running pyupgrade (Benjamin Bannier, Corelight)

* Add GH action exercising pre-commit hooks (Benjamin Bannier, Corelight)

* Add `.git-blame-ignore-revs` (Benjamin Bannier, Corelight)

* Format Python sources with Black (Benjamin Bannier, Corelight)

* Drop support for EOL python-3.7 (Benjamin Bannier, Corelight)

This version has reached EOL, and tree-sitter stopped publishing updates
for this version some time ago.

* GH-73: Pin tree-sitter dependency (Benjamin Bannier, Corelight)

We use `tree-sitter.Language.build_library` which after a deprecation
cycle went away with tree-sitter-0.22.0. Pin it, at least until we have
migrated off that API.

Closes 73.