pkg: Add activate_with_early_release for early lock release (#348) #61

Job	Run time
Test with `JETLS_DEV_MODE = true`	14m 29s
Julia 1.12 - ubuntu-latest - x64	12m 13s
Julia 1 - ubuntu-latest - x64	12m 15s
Test with `JULIA_NUM_THREADS = 4,2`	11m 53s
Julia nightly - ubuntu-latest - x64	3m 30s
Test jetls executable	6m 19s
Julia 1 - macos-latest - x64	15m 5s
Test with `JETLS_DEBUG_LOWERING = true`	12m 1s
	1h 27m 45s

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