Include PrivacyGroupId in payload

[namtruong]

A part of #1216.

This PR is specific to

• Include PrivacyGroupId in EncodedPayload
• Include PrivacyGroupId in send and receive domain objects
• Modify enclave encrypt signature to also include privacy group id
• Changes to the payload encoder and unit tests to ensure backward compatibility

[codecov-io]

Codecov Report

Merging #1239 (4f5a7e8) into master (09a715a) will decrease coverage by 0.00%.
The diff coverage is 99.66%.

@@             Coverage Diff              @@
##             master    #1239      +/-   ##
============================================
- Coverage     99.53%   99.52%   -0.01%     
- Complexity     3224     3226       +2     
============================================
  Files           496      497       +1     
  Lines          9575     9682     +107     
  Branches        483      488       +5     
============================================
+ Hits           9530     9636     +106     
  Misses            5        5              
- Partials         40       41       +1     

Flag	Coverage Δ	Complexity Δ
unittests	99.52% <99.66%> (-0.01%)	0.00 <22.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
.../main/java/com/quorum/tessera/enclave/Enclave.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...ava/com/quorum/tessera/enclave/EncodedPayload.java	99.03% <96.66%> (-0.97%)	25.00 <2.00> (+2.00)	⬇️
...n/java/com/quorum/tessera/enclave/EnclaveImpl.java	100.00% <100.00%> (ø)	41.00 <1.00> (ø)
...com/quorum/tessera/enclave/PayloadEncoderImpl.java	99.42% <100.00%> (-0.58%)	20.00 <1.00> (+1.00)	⬇️
...va/com/quorum/tessera/enclave/PrivacyMetadata.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...om/quorum/tessera/enclave/rest/EnclavePayload.java	100.00% <100.00%> (ø)	15.00 <2.00> (+2.00)
...quorum/tessera/enclave/rest/EnclaveRawPayload.java	100.00% <100.00%> (ø)	19.00 <2.00> (+2.00)
...m/quorum/tessera/enclave/rest/EnclaveResource.java	100.00% <100.00%> (ø)	21.00 <3.00> (ø)
...rum/tessera/enclave/rest/RestfulEnclaveClient.java	99.35% <100.00%> (+0.03%)	31.00 <3.00> (-2.00)	⬆️
...tessera/transaction/EncodedPayloadManagerImpl.java	100.00% <100.00%> (ø)	8.00 <0.00> (ø)
... and 9 more

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