Make common crate for TSS and test client

[ameba23]

In order to use the entropy test client in entropy_testing_utils::test_client we need to have entropy_tss as a dependency. This means we cant make a simple client without having all the dependencies from entropy-tss.

For example the testnet status page depends on it, as does the CLI for storing programs - for more context see the discussion in the PR for that: entropyxyz/programs#68 (comment)

This PR adds a new crate entropy-client which includes the bits a client needs from entropy-tss, as well as the contents of entropy_testing_utils::test_client. entropy-cilent contains for example the chain metadata and the UserSignatureRequest struct.

Since entropty-tss does not need everything in entropy-client, there is a 'full-client' feature (enabled by default) which adds the bits entropy-tss does not depend on.

To do in followups:

• The entropy-tss integration tests now don't need anything from entropy-tss. This means entropy-tss now no longer needs to be a library crate. The advantage of turning it back into just a binary crate is that we get the full API documented - not just the bits we expose as library functions.
• Ideally, everything in entropy-client should compile to wasm. Currently it does compile with --no-default-features -F wasm. But we cannot submit extrinsics because of needing subxt::tx::PairSigner. There is for sure a way round this. Also we need to access the system clock for adding timestamps to signature requests - we just need to use js_sys::Date instead of std::time::SystemTime.
• Make error types rather than using anyhow for the client.

[JesseAbram]

looks good maybe should in the future also consider common packages being being in the workspace cargo.toml

[JesseAbram]

probably should fast forward to same version as other packages?