build: use the 'org.web3j.solidity' Gradle plugin to compile contracts

[jjohannes]

Description:

See #7456

TODOs to investigate:

• make all contracts compile
• Java code is generated from system contracts
• Separate task(s) configured to compile with different EVM version for testing

Related issue(s):

Resolves #7456

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[Nana-EC]

@jjohannes any progress on this as 0.55 is complete, will this be in 0.56?
Thanks

[jjohannes]

@Nana-EC sorry this is totally an experiment at this point. I just put a milestone to satisfy the PR checks. Removed it.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4733608)	97021	63180	65.12%
Head commit (419ed84)	97021 (+0)	63178 (-2)	65.12% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#14361)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.39%. Comparing base (4733608) to head (419ed84).
Report is 88 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #14361      +/-   ##
=============================================
- Coverage      63.39%   63.39%   -0.01%     
+ Complexity     20209    20207       -2     
=============================================
  Files           2539     2539              
  Lines          94256    94256              
  Branches        9859     9859              
=============================================
- Hits           59758    59755       -3     
- Misses         30901    30903       +2     
- Partials        3597     3598       +1     

see 10 files with indirect coverage changes