perf(#872): enable parallel test execution and cache EO parsing

[volodya-lombrozo]

Enable parallel test execution and cache EO parsing results in LtByXslTest to reduce excessive test suite runtime.

Fixes #872

[volodya-lombrozo]

@rultor merge

[rultor]

@rultor merge

@volodya-lombrozo OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor merge

@volodya-lombrozo Done! FYI, the full log is here (took me 7min).

[0crat]

@volodya-lombrozo Thanks for the contribution! You've earned +12 points for this: +16 as a basis, +7.3 for your 146 hits-of-code (146 × 0.05), but -4 deducted since you exceeded 100 hits-of-code and -7.3 to cap the HoC bonus at 16 points max. While your code works, consider breaking larger contributions into smaller, more focused changes to avoid the penalty and make reviews easier - this aligns with our speed vs quality approach. Your running score is +277; don't forget to check your Zerocracy account too! 🚀