Improve project init performance

[10ko]

Click here to see the initial problem statement.

Initial problem statement.

For very large projects, we've seen the hashObject method on GitHandler being a performance bottleneck that substantially slows down initialization.

We're looking into an opt-in local cache for file hashes to speed up subsequent project scans—this issue tracks that work (see #5920 — this can optimise a very specific scenario, not a super-critical improvement).

Workaround

Unnecessary object hashing can be avoided by excluding untracked files from a Garden project. The preferred way is to use .ignorefile.

Problem statement.

For large projects, Gardn performs the full graph resolution before execution any actions. This can be optimized by doing partial graph resolution if the target actions are explicitly specified in the command.

The initial solution is available in #6002.