feat: add null driver

[ToBinio]

resolves #217

I might have misunderstood what was meant by "null driver".
But a driver that simply does not store data would be great for temporarily deactivating caching within Nitro.

[codecov]

Codecov Report

Attention: Patch coverage is 67.74194% with 10 lines in your changes missing coverage. Please review.

Project coverage is 58.75%. Comparing base (4d61c78) to head (fc3ad03).
Report is 80 commits behind head on main.

Files with missing lines	Patch %	Lines
src/drivers/null.ts	66.66%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #495      +/-   ##
==========================================
- Coverage   65.05%   58.75%   -6.30%     
==========================================
  Files          39       39              
  Lines        4055     3140     -915     
  Branches      487      526      +39     
==========================================
- Hits         2638     1845     -793     
+ Misses       1408     1286     -122     
  Partials        9        9              

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[pi0]

Thanks!