feat(tendermint): validators RPC

[onur-ozkan]

This is the initial implementation related to Tendermint staking feature on KDF. Remaining parts will be added gradually one by one similar to the validators RPC in this PR.

e.g., RPC payload structure:

komodo-defi-framework/mm2src/mm2_test_helpers/src/for_tests.rs

Lines 3102 to 3112 in 4c63f6e

	let request = json!({
	"userpass": mm.userpass,
	"method": rpc_endpoint,
	"mmrpc": "2.0",
	"params": {
	"ticker": coin,
	"filter_by_status": filter_by_status,
	"limit": limit,
	"page_number": page_number
	}
	});

filter_by_status can be set to one of All, Bonded and Unbonded. Default is All.

Explanation of Bonded and Unbonded statuses:

komodo-defi-framework/mm2src/coins/rpc_command/tendermint/staking.rs

Lines 12 to 18 in 43dbf48

	/// Validator is in the active set and participates in consensus.
	#[default]
	Bonded,
	/// Validator is not in the active set and does not participate in consensus.
	/// Accordingly, they do not receive rewards and cannot be slashed.
	/// It is possible to delegate tokens to a validator in this state.
	Unbonded,

[borngraced]

great work!

[mariocynicys]

thank YOU :)

[mariocynicys]

shouldn't we have paging optional?

[onur-ozkan]

It's already optional.

[mariocynicys]

i meant having it optional as in the sense of accepting it being None, and not applying a default.
so the pagination in this request:

komodo-defi-framework/mm2src/coins/tendermint/tendermint_coin.rs

Lines 2101 to 2107 in 61b1654

	pagination: Some(PageRequest {
	key: vec![],
	offset: ((paging.page_number.get() - 1usize) * paging.limit) as u64,
	limit: paging.limit as u64,
	count_total: false,
	reverse: false,
	}),

could follow accordingly.

it's OK though if u did this intentionally because we want the default behavior to paginate like so.