[EPIC] FCL`events` Service

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This EPIC tracks progress towards completion of the FCL events Service & implementation of the authn-refresh event.

unblocks FCL Account Switching immediately, allows future events to be sent from Wallet without client interaction.

### Tasks
- [ ] #1895 
- [ ] #1896 
- [ ] #1897 
- [ ] #1898 
- [ ] https://github.com/onflow/fcl-js/issues/1899