feat: add long list for identities

[elizabethengelman]

What

Adding a --long flag to soroban config identity ls, similar to soroban config network ls --long to print out the paths to identity configuration files.

Why

This was originally added in a previous PR (#743) and was removed at some point - presumably unintentionally. This seems like a helpful addition to help users understand where their identities are being configured.

Example output:

$ soroban config identity ls --long
/Users/elizabethengelman/.config/soroban/identity/alice.toml
Name: alice

/Users/elizabethengelman/.config/soroban/identity/bob.toml
Name: bob

/Users/elizabethengelman/.config/soroban/identity/carol.toml
Name: carol

Known limitations

N/A

[willemneal]

Looks great! Could you retarget to the branch of this PR #1086 ?

After refactoring a bit to the new location I think it's good to go!

[elizabethengelman]

Looks great! Could you retarget to the branch of this PR #1086 ?

Sure thing!

[elizabethengelman]

@willemneal I wasn't able to re-target the base branch directly on this PR, so I'm closing this in favor of AhaLabs#18