perf(katana-rpc): spawn blocking tasks

[kariy]

Resolves #1448

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (de5bbe8) 68.51% compared to head (5db4d9d) 68.51%.

❗ Current head 5db4d9d differs from pull request most recent head ebfcbb4. Consider uploading reports for the commit ebfcbb4 to get more accurate results

Files	Patch %	Lines
crates/katana/tasks/src/lib.rs	45.45%	12 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           dev/katana    #1450      +/-   ##
==============================================
- Coverage       68.51%   68.51%   -0.01%     
==============================================
  Files             220      221       +1     
  Lines           21690    21722      +32     
==============================================
+ Hits            14861    14882      +21     
- Misses           6829     6840      +11     

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[kariy]

Closing in favour of #1456