Unify TypePool usage and fix up class exposure.

[Olipro]

There was an issue where nested classes did not have their visibility
set due to having extra attributes. This then subsequently led to the
discovery of an issue where all types need to be resolveable in order
for the visitor to be able to apply the fixes.

Additionally the JVM passes class names with the foo/bar format, so we
convert to dot notation before running transformation.

All public-facing APIs remain the same.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

97.7% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #4 (9a25e81) into master (02df94b) will increase coverage by 0.29%.
The diff coverage is 97.36%.

@@             Coverage Diff              @@
##             master       #4      +/-   ##
============================================
+ Coverage     88.36%   88.65%   +0.29%     
- Complexity      195      197       +2     
============================================
  Files            24       23       -1     
  Lines           464      476      +12     
  Branches         40       43       +3     
============================================
+ Hits            410      422      +12     
+ Misses           27       26       -1     
- Partials         27       28       +1     

Flag	Coverage Δ
unittests	88.65% <97.36%> (+0.29%)	⬆️

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

Impacted Files	Coverage Δ
...ptheinter/interceptify/internal/ClassInjector.java	89.76% <95.45%> (+0.19%)	⬆️
...uptheinter/interceptify/internal/ClassExposer.java	93.18% <100.00%> (+0.77%)	⬆️

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