Implement RPC only baker

Context

This MR adds the possibility to launch the baker daemon without requiring local data. Operation filtering and block forging will be done using the ../preapply_block RPC instead of locally instantiating the protocol's context. This will result in slower block forging times but will reduce the baker's memory consumption.

See #5466 (closed)

Testing the MR

This is a semantically close equivalent of bake for which is heavily used in a lot of test scenarios.

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