feat: Add more commands.

[PI-Victor]

lock/unlock - lock, unlock an issue. milestone - add a milestone. mileston clear will remove it. pin/unpin - pin/unpin issue. had to use graphql since rest does not seem to provide a way to update the issue for pinning.

draft - move a PR to draft. this only works on payed plans. approve/unapprove - does what it says on the thin. It also adds more clauses to merge command, like not merging if it's already merged, if it's a draft, if it has conflicts, etc.

Signed-off-by: Victor Palade victor@cloudflavor.io

[linear[bot]]

CLO-47 BUG - Fix multiple commands in single comment

[PI-Victor]

/triage /assign

[PI-Victor]

/label Enhancement Feature /merge