support tls for tikv meta

[zhijian-pro]

Close #1634

[codecov-commenter]

Codecov Report

Merging #1653 (e52b336) into main (5efd718) will increase coverage by 0.10%.
The diff coverage is 77.77%.

❗ Current head e52b336 differs from pull request most recent head b28e82a. Consider uploading reports for the commit b28e82a to get more accurate results

@@            Coverage Diff             @@
##             main    #1653      +/-   ##
==========================================
+ Coverage   61.52%   61.62%   +0.10%     
==========================================
  Files         133      133              
  Lines       22573    22596      +23     
==========================================
+ Hits        13888    13925      +37     
+ Misses       7125     7108      -17     
- Partials     1560     1563       +3     

Impacted Files	Coverage Δ
pkg/meta/tkv_tikv.go	60.86% <77.77%> (-1.18%)	⬇️
pkg/sync/config.go	92.30% <0.00%> (-7.70%)	⬇️
pkg/fs/fs.go	76.87% <0.00%> (-0.79%)	⬇️
pkg/chunk/disk_cache.go	80.19% <0.00%> (-0.49%)	⬇️
pkg/meta/sql.go	67.28% <0.00%> (+0.20%)	⬆️
cmd/sync.go	67.62% <0.00%> (+0.81%)	⬆️
pkg/meta/sql_lock.go	74.67% <0.00%> (+2.59%)	⬆️
pkg/sync/sync.go	44.44% <0.00%> (+4.70%)	⬆️

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[davies]

@zhijian-pro please update the docs