feat: Allow local (fs) comparison

[diervo]

Details

Allow offline (file-system) comparison between two arbitrary commits.

Does this PR introduce a breaking change?

• No

[salesforce-best-lwc-internal]

Benchmark comparison

Base commit: e1bdbb7 | Target commit: 78310db

object_keys (simple-benchmarks)	base(e1bdbb7)	target(78310db)	trend
stringify_parse	34.30 (± 0.10 ms)	35.30 (± 0.30 ms)	-2.92% 👎
deep_merge	25.15 (± 0.85 ms)	25.85 (± 0.75 ms)	-2.78% 👎

simple-item (lwc-examples-prod)	base(e1bdbb7)	target(78310db)	trend
create_and_render	50.00 (± 0.40 ms)	51.90 (± 0.40 ms)	-3.80% 👎

simple-item (lwc-examples-compat)	base(e1bdbb7)	target(78310db)	trend
create_and_render	83.70 (± 0.70 ms)	85.90 (± 0.90 ms)	-2.63% 👎