Implement `secrets rm` command

[tegefaulkes]

Specification

The secrets rm command will remove one or more files specified by paths.

1. Will remove the file at the specified path.
2. Multiple paths can be specified.
3. Supports wildcard and globing.
4. Supports a -r recursive option for deleting directories with contents.
5. Supports normal and secret paths.

Additional context

Related #32

Tasks

1. Implement secret rm command.
2. Supports multiple specified paths.
3. supports wildcard and globing
4. supports a -r option to recursively delete directories and their contents.

[linear]

ENG-360 Implement `secrets rm` command

[tegefaulkes]

@aryanj this one comes after the cat command. Ignore tasks 3 and 4 for now. Should be simple to implement since it doesn't require and content streaming.

[aryanjassal]

@aryanj this one comes after the cat command. Ignore tasks 3 and 4 for now. Should be simple to implement since it doesn't require and content streaming.

The secrets cat command relies on the implementation of streaming file contents via the VaultsSecretsGet handler. It can work without it, but it would need to be changed anyways once that has been implemented. As we still need to put a bit more thought into that, I will be working on this command.

[aryanjassal]

I don't think we even can implement the -f option, as that option forcefully removes unwritable files, but the vaults don't have any concept of actual file perms, so it will be redundant.

Following this, I will remove -f from spec.