Introduce abstraction for CurrencyId into farming pallet

[RustNinja]

Farming Pallet is very useful and this PR focused to Introduce abstraction for currency id into farming pallet via loose pallet coupling that is more flexible and preferable in most cases.

Here is the changes that was added:

• introduce associated type CurrencyId for farming pallet
• update all runtimes (Polkadot/Kusama)
• update unit tests and mock runtimes

Once this changes was merged anyone will able to use farming pallet in their runtimes.

[ark930]

Run command SKIP_WASM_BUILD= cargo check -p node-cli --locked --features "with-all-runtime" failed

[gianfra-t]

Hi @ark930, we have fixed the failing command and merged with the latest dev branch. Running tests locally seems to work okay, could you please give it a try at the CI?

[gianfra-t]

Sorry it failed with check. Must have broken with the merge.
Could you please tell me what commands does the CI run so I can test all of them locally?

[ark930]

@gianfra-t make check-all && make clippy && make test-all

[gianfra-t]

Thanks @ark930, I have replaced the currency id in the benchmarks for the default so it is compatible with the generic implementation. I believe this should not introduce any fundamental difference, but please let me know.