Improve CordaRPCClient to support reconnects

Description

Currently the `ReconnectingCordaRPCOps` uses a wrapper over the DataFeed that no longer exposes an rx Observable.

This prevents this reconnecting approach to being wired into the main code because it changes the API.

See Slack:

Assignee

Dimos Raptis

Reporter

Tudor Malene

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Priority

Medium

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Fix versions

Affects versions

None

Ported to...

Corda 4.3

Story Points / Dev Days

8

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