Allow MorleyClient to run without tezos-client in RPC-only mode

Description

Allow morley client to run without tezos-client:

1. Implement fee calculation in Haskell
2. Submit transactions with RPC

Related issue(s)

Resolves https://issues.serokell.io/issue/SDAO-275

✅ Checklist for your Merge Request

Related changes (conditional)

• Tests (see short guidelines)

  • If I added new functionality, I added tests covering it.
  • If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.

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    • Root README and other README.md files
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  • I updated changelog files of all affected packages released to Hackage if my changes are externally visible.

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