Create firefly contract subscription per namespace

[shorsher]

Each namespace now has a unique firefly contract subscription

To support a subscription per namespace, the fireflyContract config section has been replaced with the contracts array section under the multiparty config.

Example:

blockchain:
- name: blockchain0
  type: ethereum
  ethereum:
    ethconnect:
      url: http://ethconnect_0:8080
      topic: "0"
      
namespaces:
  default: default
  predefined:
  - name: default
    remoteName: default
    description: Default predefined namespace
    plugins: [database0, blockchain0, dataexchange0, sharedstorage0, erc20_erc721]
    multiparty:
      enabled: true
      org:
        name: org0
        description: org0
        key: 0x123456
      contract:
        - location:
            address: 0x4ae50189462b0e5d52285f59929d037f790771a6 
          firstEvent: oldest

• location is a yaml object containing blockchain plugin configuration
• firstEvent is replacing fromBlock, supporting values of newest or oldest

This PR also introduces a new component, multiparty manager, that is responsible for managing the active firefly contract and interfacing with the blockchain plugin on behalf of that contract.

The subscription names will now also contain the name of the namespace it's associated with:

• Ethereum: namespaceName_abiName_instanceUniqueHash
• Fabric: namespaceName_event

[codecov-commenter]

Codecov Report

Merging #865 (3d8ba8e) into main (7a340a9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 3d8ba8e differs from pull request most recent head 5341f8d. Consider uploading reports for the commit 5341f8d to get more accurate results

@@           Coverage Diff           @@
##             main     #865   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files         299      300    +1     
  Lines       19481    19508   +27     
=======================================
+ Hits        19475    19502   +27     
  Misses          5        5           
  Partials        1        1           

Impacted Files	Coverage Δ
internal/blockchain/ethereum/config.go	100.00% <ø> (ø)
internal/blockchain/fabric/config.go	100.00% <ø> (ø)
internal/coreconfig/coreconfig.go	100.00% <ø> (ø)
pkg/core/namespace.go	100.00% <ø> (ø)
internal/batchpin/batchpin.go	100.00% <100.00%> (ø)
internal/batchpin/operations.go	100.00% <100.00%> (ø)
internal/blockchain/ethereum/ethereum.go	100.00% <100.00%> (ø)
internal/blockchain/ethereum/eventstream.go	100.00% <100.00%> (ø)
internal/blockchain/fabric/eventstream.go	100.00% <100.00%> (ø)
internal/blockchain/fabric/fabric.go	100.00% <100.00%> (ø)
... and 9 more

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[shorsher]

Note: I was not sure if I needed to make changes to the ContractManager to use the new MultipartyManager instead of directly interfacing with the blockchain plugin. @awrichar I know we spoke about this briefly, but since the contract manager deals with custom contracts I did not think it needs to be aware of the multiparty manager.