Use java.lang.StackWalker instead of sun.misc.*

[TimvdLippe]

java.lang.StackWalker is the public API shipped in Java 9. Tentatively opening this PR to see whether the memory improvements are still there.

[codecov-io]

Codecov Report

Merging #2225 (e36cb84) into release/3.x (ea6d7ad) will decrease coverage by 2.92%.
The diff coverage is 11.42%.

@@                Coverage Diff                @@
##             release/3.x    #2225      +/-   ##
=================================================
- Coverage          84.64%   81.71%   -2.93%     
+ Complexity          2726     2694      -32     
=================================================
  Files                326      326              
  Lines               8315     8324       +9     
  Branches             990      988       -2     
=================================================
- Hits                7038     6802     -236     
- Misses              1006     1261     +255     
+ Partials             271      261      -10     

Impacted Files	Coverage Δ	Complexity Δ
...ternal/exceptions/stacktrace/StackTraceFilter.java	32.69% <11.42%> (-48.27%)	8.00 <3.00> (-2.00)
...util/reflection/InstrumentationMemberAccessor.java	11.50% <0.00%> (-75.00%)	1.00% <0.00%> (-24.00%)
...al/creation/bytebuddy/SubclassInjectionLoader.java	25.53% <0.00%> (-31.92%)	4.00% <0.00%> (-2.00%)
...ito/internal/creation/bytebuddy/ModuleHandler.java	6.71% <0.00%> (-16.11%)	2.00% <0.00%> (ø%)
...al/creation/bytebuddy/InlineBytecodeGenerator.java	72.92% <0.00%> (-11.36%)	35.00% <0.00%> (-3.00%)
...internal/util/reflection/ModuleMemberAccessor.java	81.81% <0.00%> (-9.10%)	6.00% <0.00%> (ø%)
...l/creation/bytebuddy/InlineByteBuddyMockMaker.java	66.85% <0.00%> (-0.58%)	48.00% <0.00%> (-1.00%)
...va/org/mockito/junit/jupiter/MockitoExtension.java	89.47% <0.00%> (-0.27%)	9.00% <0.00%> (ø%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ea6d7ad...e36cb84. Read the comment docs.

[TimvdLippe]

I didn't get to this and the memory test has been disabled (#2478). Let's revisit this as part of resolving #2478