New CLI manager operation to recover SCORU bonds

Context

This MR partially addresses (the new direction of) #2943 (closed). It:

• adds a new manager operation (Sc_rollup_return_bond) in the protocol
• extends the client to support this new command
• extends an integration test in lib_protocol to trigger return_bond/withdraw stake in a legit and in a non-legit configuration
• extends a Tezt tests to test the new addition in the Client (both a legit and non-legit stake withdrawal)

Note that:

• There are still some holes in Apply that should be filled once Bonds freeze is implemented.
• Tezt test has some placehoders that should be adapted

Manually testing the MR

dune exec src/proto_alpha/lib_protocol/test/integration/operations/main.exe -- test "^sc rollup$"

and

dune exec tezt/tests/main.exe -- --file sc_rollup.ml \
    --test "Alpha: observing the correct handling of commitments in the rollup node (no_commitment_publish_before_lcc)"

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR