More granular permissions

[noctuid]

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There are a copule relevant issues open: #36 and #153

It would be nice if permissions in general were more granular like in opencode. Opencode lets you configure for specific commands with wildcards as well as what files can be read/edited/etc.

I think particularly useful the external_directory config, which lets you blacklist or whitelist directories. I'd like to let eca ask for permission to look at other code repos, but I'd prefer if it couldn't even ask for permission to read anything else.

"external_directory": {
      "*": "deny",
      "~/src/**": "ask",
}

[ericdallo]

Currently ECA alreayd ask for permissions for anything other than workspaceRoot, like other repos, unless you "approve and remember", so maybe you want some way to configure that like in that config and/or we could improve approve and remember like in those issues.
tagging @zikajk as this is no easy issue to solve as there are multiple ways to solve it