Support for static members

[rpau]

This patch adds support to monitor when a class is loaded
or the static methods are executed. Then, for example, if a
class is loaded dynamically by spring when the test starts,
this is instrumented.

If fields are accessed and they do not have a related behavior
to the class, they should be ignored.

[codecov]

Codecov Report

Merging #6 into master will increase coverage by 0.06%.
The diff coverage is 87.5%.

@@             Coverage Diff              @@
##             master       #6      +/-   ##
============================================
+ Coverage     81.93%   81.99%   +0.06%     
- Complexity      121      123       +2     
============================================
  Files            13       13              
  Lines           404      411       +7     
  Branches         34       37       +3     
============================================
+ Hits            331      337       +6     
  Misses           48       48              
- Partials         25       26       +1

Impacted Files	Coverage Δ	Complexity Δ
...junit4git/core/bytecode/AgentClassTransformer.java	76.66% <100%> (ø)	12 <1> (ø)	⬇️
...rg/walkmod/junit4git/javassist/JavassistUtils.java	86.04% <85.71%> (-0.07%)	10 <0> (+2)

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