Add macaroon permissions for the new StaticOpenChannel RPC method
and change StaticAddressLoopIn action from read to execute to match
other swap operations.
The Lightning Node Connect (LNC) WASM client currently imports both
`looprpc` and the entire `loop` module to access `perms.go`. This
creates problems because `loop` imports `taproot-assets`, resulting in
too many symbols for the WASM build.
To fix this, we will move `perms.go`—which defines RPC endpoint
permissions—into `looprpc`. After this change, the LNC WASM client will
import only `looprpc`, while the rest of `loop` can continue importing
`taproot-assets` without affecting the LNC WASM build.
