Fixed java reserved words codegen errors

[NickSneo]

What does this PR do?

Fixes the issue where users were not able to generate java wrappers if there was any java reserved word in their solidity code or ABI file.

Where should the reviewer start?

review all files

Why is it needed?

Fixes - #1773

[codecov]

Codecov Report

Merging #1975 (a835a28) into master (6435c35) will decrease coverage by 0.05%.
Report is 2 commits behind head on master.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master    #1975      +/-   ##
============================================
- Coverage     68.49%   68.45%   -0.05%     
  Complexity     3005     3005              
============================================
  Files           488      488              
  Lines         12561    12566       +5     
  Branches       1638     1642       +4     
============================================
- Hits           8604     8602       -2     
- Misses         3482     3485       +3     
- Partials        475      479       +4     

Files	Coverage Δ
...n/java/org/web3j/crypto/StructuredDataEncoder.java	89.65% <100.00%> (-0.12%)	⬇️
...ava/org/web3j/codegen/SolidityFunctionWrapper.java	90.08% <72.22%> (-0.41%)	⬇️

... and 1 file with indirect coverage changes

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