Generate better precompilation info for system image

[jakebolewski]

Description

Currently we are running / exercising a test harness to be able to generate method definitions for precompilation / system image compilation. It would be better to have explicit method definitions for precompilation (though a precompilation file) generated by recording a substantive climate machine run or ex. through external packages like SnoopCompile. This should help with module loading times and runtimes if we ship the statically precompiled version of ClimateMachine.

Steps

• [ ] Identify representative codes for exercising ClimateMachine for precompilation
• [ ] Determine the method for pre-compilation file generation
• [ ] Add precompiled file to sysimage generation
• [ ] Documentation for regenerating the precompilation file.

cc @simonbyrne

Additional context

Add any other reasons why this should be addressed.

For CLIMA Developers

• [ ] This feature can be added (if it cannot be, explain why in a comment below -- lack of technical expertise, not relevant to the scope of this project, too ambitious)
• [ ] There is a timeline for when this feature can be implemented
• [ ] The feature has been (or will be) implemented (Please link the PR)

[jakebolewski]

I think before the next tagged release we can add a pre-compile file generated from running the unit test suite:

https://julialang.github.io/PackageCompiler.jl/dev/sysimages/#Using-a-package's-test-suite-to-generate-precompile-statements-1

We'll have to merge gpu and cpu enabled generated output