[NR-168546] Disable instrumentation of signed artifacts

[cthomas-newrelic]

The JAR must be written unchanged if ASM can't parse a signed JAR entry.

• update sample app to add network io and BouncyCastle
• add/update instrumentation tests

[codecov[bot]]

Codecov Report

Merging #146 (3d5a684) into develop (ac94a07) will increase coverage by 0.14%. The diff coverage is 27.02%.

@@              Coverage Diff              @@
##             develop     #146      +/-   ##
=============================================
+ Coverage      53.32%   53.46%   +0.14%     
- Complexity      2882     2884       +2     
=============================================
  Files            304      304              
  Lines          15137    15151      +14     
  Branches        1627     1629       +2     
=============================================
+ Hits            8072     8101      +29     
+ Misses          6235     6211      -24     
- Partials         830      839       +9     

Files	Coverage Δ
...a/com/newrelic/agent/compile/ClassTransformer.java	59.60% <90.90%> (+16.25%)	:arrow_up:
...lic/agent/android/ClassTransformWrapperTask.groovy	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

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[ywang-nr]

1. One of the tests failed in Android CI
2. Do you want to merge this PR to release branch?