This presents an alternative approach to #20, enabling the specification of max-depth per source directory + tries to enhance the performance by using parallelization.

Changes Proposed

• add --max-depth (-d) to config, example usage tms config --paths /src/rust /src/go -d 1 1
• parallelize repo lookup using rayon
• old configs should continue to work, the old search_paths will be merged into the new search_dirs if present
• updated dependencies and fixed some typos

Additional Information

The len of --paths and --max-depth should match, but if it doesn't (tms config --paths /src/rust /src/go -d 1) then the max-depth for /src/go would default to 10.

Config-Example:

[[search_dirs]]
path = '/src/rust'
depth = 1

Disclaimer: I know nothing about rust, although the code works it's very possible that there are issues.