Privacy group manager and publishers

[namtruong]

A part of #1216.

This PR is specific to

• PrivacyGroup related domain objects
• Utility to encode and decode privacy group data, calculate privacy group ids from members
• PrivacyGroupManager that handles logic for privacy groups including create, find, retrieve, store, delete
• Publisher to publish privacy group encoded data to its members
• Api version 3.0 to indicate a node's support for privacy group

[codecov-io]

Codecov Report

Merging #1225 (ddbe49a) into master (4124af8) will increase coverage by 0.00%.
The diff coverage is 99.67%.

@@            Coverage Diff             @@
##             master    #1225    +/-   ##
==========================================
  Coverage     99.52%   99.53%            
- Complexity     3115     3176    +61     
==========================================
  Files           472      488    +16     
  Lines          9134     9442   +308     
  Branches        474      483     +9     
==========================================
+ Hits           9091     9398   +307     
  Misses            5        5            
- Partials         38       39     +1     

Flag	Coverage Δ	Complexity Δ
unittests	99.53% <99.67%> (+<0.01%)	0.00 <61.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/quorum/tessera/enclave/PrivacyGroup.java	98.36% <98.36%> (ø)	0.00 <0.00> (?)
...a/com/quorum/tessera/enclave/PrivacyGroupUtil.java	100.00% <100.00%> (ø)	10.00 <10.00> (?)
...om/quorum/tessera/version/PrivacyGroupVersion.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)
...orum/tessera/privacygroup/PrivacyGroupManager.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)
.../tessera/privacygroup/PrivacyGroupManagerImpl.java	100.00% <100.00%> (ø)	21.00 <21.00> (?)
...group/exception/PrivacyGroupNotFoundException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...p/exception/PrivacyGroupNotSupportedException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...ygroup/exception/PrivacyGroupPublishException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...oup/publish/BatchPrivacyGroupPublisherFactory.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...acygroup/publish/PrivacyGroupPublisherFactory.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
... and 22 more

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