To snapshot a Java class (+ its fields and methods), previously we used
Gson to serialize a class field/method to a string via reflection, and
hash that string.
We now use an ASM ClassWriter to write a placeholder class containing
the field/method of interest and hash the bytecode of that class.
One experiment showed that this new approach is ~10 times faster than
the previous approach (140s down to 16s when snapshotting 600 jars).
Test: Updated expectation files for JavaClassSnapshotterTest unit tests
+ Existing integration tests to prevent regression
^KT-52141 In Progress
Hung Nguyen
9eb3c7ed76