re-enable precompilation

[aviatesk]

Also precompiles the top-level analysis code.

From CHANGELOG.md:

Precompilation of JET has been re-enabled. This should significantly improve
startup times:

$ julia --startup-file=no -e '
    macro simpletime(ex)
        :(let s = time()
            $(ex)
            e = time()
            elapsed = round(e - s; digits=2)
            println("  Elapsed: $elapsed sec")
        end)
    end
    @SimpleTime using JET
    @SimpleTime @report_call sum("julia")
    @SimpleTime report_file(normpath(pkgdir(JET), "demo.jl"); toplevel_logger=nothing)'

v0.10.6
    Elapsed: 1.25 sec
    Elapsed: 10.08 sec
    Elapsed: 11.43 sec
This version
    Elapsed: 1.33 sec
    Elapsed: 0.01 sec
    Elapsed: 0.14 sec

This makes the precompilation during installation take longer.
If you're developing JET itself, we recommend having:

LocalPreferences.toml

[JET]
precompile_workload = false

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (e28c9a1) to head (d53ce42).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #716   +/-   ##
=======================================
  Coverage   86.91%   86.91%           
=======================================
  Files          13       13           
  Lines        2821     2821           
=======================================
  Hits         2452     2452           
  Misses        369      369           

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