Update Subspace testnet. (#6373)
* add basic config, logos, endpoints, config.
* update spec name, test color with gradient
* Fix conflict - alphabetical order
* updated custom types
* fix local rpc node to wss://dev-rpc.subspace.network
* Fix typo
* Fix PoCEquivocationOffence tytpe
Fix PoCEquivocationOffence offender as FarmerId
* fix: sorted Spartan Testnet app-config locales, testing endpoints, chainLogo
* update subspace spec definitions
* Update configs to subspace, extend api.derive.chain with custom headers
* Rename POC to SUB, remove spartan
* Fix defs in alphabetical order, updated definitions to subspace
* Chain logo named to subspace
* Fix, SUB prefix to Sub
* Add testnet wss, Update FarmerPublicKey type
Co-authored-by: Nazar Mokrynskyi <nazar@mokrynskyi.com>
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