feat(directory): Add truncate_repo_length option

[Sberm]

Description

Expand truncated repo name to the parent directories to preserve more information.

The default value for truncate_repo_length is 1, which doesn't change any behavior that truncate_to_repo = true already has.

truncate_repo_length will work only when truncate_to_repo is set to true.

For example, you are in sub directory src where you initialized as a git repo. But you also want to know what it's parent directory is, like project/src, you can set truncate_repo_length = 2 to do that.

Motivation and Context

Closes #5774

Screenshots (if appropriate):

starship is the git repo, when truncate_repo_length = 2 is set, directories expand to left by one.

when truncate_repo_length = 4

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.