feat(#133): Add MeasuredXsl And Tweak line-is-absent Check

[volodya-lombrozo]

In this PR I've:

1. Added MeasuredXsl that can measure time of all xsl transformations and prints messages into a log:

18:35:05 [WARN] org.eolang.lints.MeasuredXsl: XSL transformation 'sparse-decoration' took 473ms, whereas threshold is 100ms

2. I tweaked line-is-absent check:

From ProgramTest#lintsLargeJnaClass(@Mktmp final Path home):

Before:

org.eolang.lints.MeasuredXSL: XSL transformation 'line-is-absent' took 4s, whereas threshold is 100ms

After:

17:51:22 [WARN] org.eolang.lints.MeasuredXSL: XSL transformation 'line-is-absent' took 117ms, whereas threshold is 100ms

---

Benchmark

Before:

Input: com/sun/jna/Pointer.class
Size of .class: 22Kb (22Kb bytes)
Size of .xmir after disassemble: 1Mb (1Mb bytes, 29630 lines)
Lint time: 9s (9332 ms)

After:

Input: com/sun/jna/Pointer.class
Size of .class: 22Kb (22Kb bytes)
Size of .xmir after disassemble: 1Mb (1Mb bytes, 29630 lines)
Lint time: 7s (7200 ms)

Realted to #133.

[volodya-lombrozo]

@yegor256 Could you have a look, please?

[yegor256]

@volodya-lombrozo maybe it's better to put it into test/ directory? It's only for tests, right?

[volodya-lombrozo]

@yegor256 I can't place it into test/ directory, since I use in in LintByXsl class.

[yegor256]

@volodya-lombrozo let's make it package private then

[yegor256]

@volodya-lombrozo let's make this class package-private, since it's not part of external API of this library