Add support for "tparallel"

[moricho]

tparallel finds inappropriate or inefficient usage of t.Parallel() method in Go test codes.
It detects the following:

• insufficient parallelization: t.Parallel() is called in either a top-level test function or a sub-test function only
• inappropriate teardown process: Although t.Parallel() is called in the sub-test function, it is post-processed by defer instead of t.Cleanup()

Particularly in tests that access the database, the communication time to the database takes up a large portion of the test time, so we can reduce the test time by executing the test code in parallel appropriately.

[boring-cyborg]

Hey, thank you for opening your first Issue ! 🙂 If you would like to contribute we have a guide for contributors.