meta/sql: support new backup

[jiefenghuang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 2.08711% with 1079 lines in your changes missing coverage. Please review.

Project coverage is 23.21%. Comparing base (450d0de) to head (9f45e5b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/meta/sql_bak.go	0.00%	688 Missing ⚠️
pkg/meta/backup.go	10.74%	191 Missing ⚠️
pkg/meta/base.go	0.00%	102 Missing ⚠️
pkg/meta/sql.go	0.00%	75 Missing ⚠️
pkg/meta/tkv_bak.go	0.00%	12 Missing ⚠️
pkg/meta/redis_bak.go	0.00%	9 Missing ⚠️
pkg/meta/tkv.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5344       +/-   ##
===========================================
- Coverage   54.90%   23.21%   -31.69%     
===========================================
  Files         161       29      -132     
  Lines       44415    17589    -26826     
===========================================
- Hits        24384     4083    -20301     
+ Misses      17357    13021     -4336     
+ Partials     2674      485     -2189     

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[davies]

LGTM, merging now.