tests: show compile time and runtime for each _test.v file in separate columns

[spytheman]

• benchmark: support passing an optional preparation time for the step messages
• pref: support a -skip-running option
• testing: add compile_begin and compile_end messages to the testing.Reporter interface
• testing: support the new messages in the output_normal.v Reporter
• benchmark: add Benchmark.step_restart/0 method
• tools: fix v test to not skip _test.c.v files by default
• testing,benchmark: use the new -skip-running and the enhanced Reporter to implement a separate compilation time measurement for each test

[spytheman]

The output for v test vlib/builtin/ will look like this:

[felipensp]

Nice improvement.

[spytheman]

Nice improvement.

thank you

[shove70]

wow, It's beautiful 👍

[ttytm]

@spytheman since this commit the -stats flag won't include prints in the test output.

For example, if you run one of the vpm tests without -d network but with -stats the tests run without information such as the following, which used to be provided.

> skipping /Users/t/Nextcloud/Dev/vlang/v/cmd/tools/vpm/remove_test.v, when `-d network` is missing