feat(runtime): add support for executing test specs

[johnyob]

Context

This PR adds support for executing test specifications. The test executor runs the tests and associated lifecycle hooks.

Description

Dependencies: #1378

All logic for this PR is in jstz_test/executor.rs, the bulk of it being in test_specifier.

• TestEventTracker is taken from https://github.com/denoland/deno/blob/82eba477fbea8a11127bf2a678413be24e0857a0/cli/tools/test/mod.rs#L1871
• test_specifier is the function responsible for executing all tests in a given module specifier. The execution plan is as follows:
  1. Execute all beforeAll hooks (in FIFO order)
  2. For each test:
     3. Execute all beforeEach hooks (FIFO order)
     4. Execute test
     5. Execute all afterEach hooks (LIFO order)
  3. Execute all afterAll hooks (LIFO order)

Manually testing the PR

cargo test --package jstz_runtime --lib --features v2_runtime -- ext::jstz_test::executor

[codecov]

Codecov Report

❌ Patch coverage is 92.64706% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.38%. Comparing base (a2c945d) to head (20a5497).

Files with missing lines	Patch %	Lines
crates/jstz_runtime/src/ext/jstz_test/executor.rs	92.64%	16 Missing and 19 partials ⚠️

Files with missing lines	Coverage Δ
crates/jstz_runtime/src/ext/jstz_test/mod.rs	44.00% <ø> (+9.09%)	⬆️
crates/jstz_runtime/src/ext/jstz_test/executor.rs	92.64% <92.64%> (ø)

... and 2 files with indirect coverage changes

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[zcabter]

Remove?

[zcabter]

Doc comment overview of how this works would be helpful for future maintainers