sequencer: implement oracle-related actions #1446
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## Summary implement oracle module actions `AddCurrencyPair` and `RemoveCurrencyPair` see https://github.com/skip-mev/connect/blob/main/proto/connect/oracle/v2/tx.proto and https://github.com/skip-mev/connect/blob/9ea31680774e2f71e683c0a4989df5bf2d5f2302/x/oracle/keeper/msg_server.go#L28 for relevant connect code ## Background these are required for the oracle authorities to be able to add/remove currency pairs from state; these are the pairs whose prices will be included in VEs. ## Changes - implement oracle module actions `AddCurrencyPair` and `RemoveCurrencyPair` - make `CurrencyPairState.QuotePrice` optional, to reflect that this may not be set upon currency pair initialization (as no oracle price has been received for it) - remove `get/put_num_removed_currency_pairs` from the oracle state_ext as it's not needed for our logic due to the fact that we execute txs in the proposal phase, so by the time vote extensions are issued for a block, the state has already been updated and currency pairs that are removed in that block have already been removed. ## Testing unit tests ## Breaking Changelist - adds new actions to the sequencer - sequencer genesis is also updated (new fees) ## Related Issues part of # #1446
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follow up to #1236.
slinky contains
Msgtypes which should be implemented as actions within the sequencer:┆Issue Number: ENG-786
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