[WIP] scan tikv as a stream

[davies]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 11.42857% with 62 lines in your changes missing coverage. Please review.

Project coverage is 25.02%. Comparing base (aab30fa) to head (f4ec590).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/meta/tkv.go	16.66%	38 Missing and 2 partials ⚠️
pkg/meta/tkv_tikv.go	0.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5080      +/-   ##
==========================================
+ Coverage   24.99%   25.02%   +0.02%     
==========================================
  Files          25       25              
  Lines       16047    16041       -6     
==========================================
+ Hits         4011     4014       +3     
+ Misses      11547    11543       -4     
+ Partials      489      484       -5     

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