[teerex] introduce ShardConfig

[brenzi]

in teerex primitives, add ShardConfig type

in teerex pallet, add storage

ShardConfig: map ShardIdentifier -> ShardConfig

and dispatchable

callable by enclave with shard's configured EnclaveFingerprint or root origin If shard doesn't exist, create it if sender registered enclave with wame Fingerprint than the config

• must update ShardStatus

consider adding lazy garbage collection unregister_shard(ShardIdentifier)

• unregister only if shard inactive for some time
• must unregister ShardStatus too

[brenzi]

this actually prepares for solutions closing

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• 1108 / #85