feature(keyringctl): support query expressions for packet field selection

Instead of simply string matching a line, we now traverse the packet as a tree and match the path based on a depth first search.

While traversing, we support logical OR and current depth * wildcard processed as a component based query expression.

Callee's are adjusted to specifically select the appropriate Issuer at the correct depth.

Fixes #185 (closed)

added scopebug scopeenhancement labels

requested review from @dvzrv, @diabonas, and @eworm

assigned to @anthraxx

I like this approach! I found one bug in the tree traversal, see inline comment, that would stop arojas's key from getting validated correctly, see the inline comment, otherwise this looks good to me :)

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• 099df52a - feature(keyringctl): support query expressions for packet field selection

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The change looks alright. Happy to see you also extended the tests to check for return values

merged