Compile AOT.

[davidmorgan]

Add an alternative compile path using AOT, don't try to automatically switch to it yet, just add flags.

Small change to make AOT compile work: pass the package config to the child process, the AOT snapshot doesn't have that available.

Add basic end to end test coverage.

As expected startup is a lot faster

JIT
> edit-benchmark; dart run build_runner build
2s built_value_generator:built_value on 1001 inputs: 998 skipped, 1 not triggered, 2 same; spent 1s analyzing                                                                                                                                                 
1s source_gen:combining_builder on 1001 inputs: 999 skipped, 2 same; spent 1s tracking                                                                                                                                                                        
                                                                                                                                                                                                                                                              
Built with build_runner/jit in 5s; wrote 4 outputs.

AOT
> edit-benchmark; dart run build_runner build --force-aot
0s built_value_generator:built_value on 1001 inputs: 998 skipped, 1 not triggered, 2 same                                                                                                                                                                     
1s source_gen:combining_builder on 1001 inputs: 999 skipped, 2 same                                                                                                                                                                                           
                                                                                                                                                                                                                                                              
Built with build_runner/aot in 1s; wrote 4 outputs.

and throughput

JIT
> edit-benchmark; dart run build_runner build
38s built_value_generator:built_value on 5001 inputs: 1 not triggered, 5000 same; spent 20s analyzing, 15s building, 1s resolving                                                                                                                             
42s source_gen:combining_builder on 5001 inputs: 1 skipped, 5000 same; spent 19s building, 17s tracking, 5s analyzing                                                                                                                                         
                                                                                                                                                                                                                                                              
Built with build_runner/jit in 84s; wrote 10000 outputs.

AOT
23s built_value_generator:built_value on 5001 inputs: 1 not triggered, 5000 same; spent 11s analyzing, 10s building                                                                                                                                           
30s source_gen:combining_builder on 5001 inputs: 1 skipped, 5000 same; spent 14s tracking, 12s building, 5s analyzing                                                                                                                                         
                                                                                                                                                                                                                                                              
Built with build_runner/aot in 56s; wrote 10000 outputs.

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