feat/modify rotate key to ask for all signatures

[Jiloc]

Description

Make sure that rotate keys is signed by all signers.

Changes

• modify estimate_fees to accept a new parameter require_all_signatures that forces the estimate to expect all signers signatures.
• modify coordinator sign_stacks_transaction to wait for all signatures in case of a RotateKeyTx.

Testing Information

• extended unit tests for estimate_fees

Checklist:

• I have performed a self-review of my code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[djordon]

Looks good. If you have the time, I would add a test that an honest coordinator would not submit a rotate-keys contract call transaction if one of the signers does not send a signature.

[Jiloc]

Looks good. If you have the time, I would add a test that an honest coordinator would not submit a rotate-keys contract call transaction if one of the signers does not send a signature.

I added a test, but I don't like how I did it :( Open to suggestions if you have a better way in mind. Expecially to avoid exposing the config_mut() to force a validation to fail on one of the signers

[matteojug]

There may be an issue with this feature (blocking merge pending confirmation)

[MCJOHN974]

Enum variant name RotateKeysV1 and "regardless of the version" comment looks a bit confusing. Maybe something like

/// Returns true if the transaction is a rotate keys transaction, regardless
/// of it's contens.