Add status line info to the submodule list view

[nicklundin08]

Add status line info to the submodule list view

Adds a QOL status line to the git submodules feature, inspired by the default power level 10k status line. This is a pretty basic first pass that only includes 3 values snagged from running git status --porcelain but I think it could be extended to include all of the values in the table (potentially). See the list view on the left in the submodules pane for the changes

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[nicklundin08]

I'm getting this error intermittently. New to go but unsure what is causing this. Maybe something with my environment? Im using WSL

--- FAIL: TestIntegration/bisect/from_other_branch (0.46s)
go_test.go:51:
Error Trace: /home/nick/clones/lazygit/go_test.go:51
Error: Received unexpected error:
POTENTIAL DEADLOCK: Recursive locking:
current goroutine 2 lock 0xc0000149e0