Support tx submission without tezos-client

Description

Problem: all high-level actions in morley-client require tezos-client to be available. Not everyone has it in their system and it adds extra burden to install it. Sometimes it is preferrable to use only RPC.

Solution: tezos-client is not strictly required to submit transactions. Transaction submission uses only a few methods from HasTezosClient and can be implemented without launching the actual tezos-client. To have a different implementation of HasTezosClient we define a new monad (MorleyOnlyRpcM) which implements HasTezosRpc the same way as the existing MorleyClientM, but implements HasTezosClient differently. Signing happens in memory, other functions essentially do nothing or throw exceptions.

Note: the first attempt to solve this problem was !725 (closed). I am using a different approach here because that one seemed a bit weird: there we combine 2 ways of passing actions: type classes and function arguments.

Also I've expanded the BlockOperation type to include information that I need in one project.

Related issue(s)

None, I need it in another project.

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