meta: encrypt the secret-key and encrypt-key in setting

[SandyXSD]

1. set secret-key again using config command will make keys encrypted
2. once encrypted, old client is unable to connect to the data storage again

[codecov-commenter]

Codecov Report

Merging #1562 (ae00eea) into main (012bc88) will decrease coverage by 0.16%.
The diff coverage is 48.38%.

❗ Current head ae00eea differs from pull request most recent head 239c497. Consider uploading reports for the commit 239c497 to get more accurate results

@@            Coverage Diff             @@
##             main    #1562      +/-   ##
==========================================
- Coverage   61.28%   61.11%   -0.17%     
==========================================
  Files         133      133              
  Lines       22273    22365      +92     
==========================================
+ Hits        13650    13669      +19     
- Misses       7078     7145      +67     
- Partials     1545     1551       +6     

Impacted Files	Coverage Δ
cmd/destroy.go	14.28% <0.00%> (ø)
cmd/format.go	59.66% <20.00%> (-1.46%)	⬇️
pkg/meta/config.go	36.00% <37.03%> (+2.66%)	⬆️
cmd/config.go	67.26% <77.77%> (-0.62%)	⬇️
pkg/meta/redis.go	72.47% <80.00%> (-0.23%)	⬇️
pkg/meta/sql.go	66.71% <80.00%> (-0.46%)	⬇️
pkg/meta/tkv.go	76.08% <80.00%> (+0.64%)	⬆️
cmd/fsck.go	68.36% <100.00%> (ø)
cmd/gateway.go	87.30% <100.00%> (ø)
cmd/gc.go	78.92% <100.00%> (ø)
... and 9 more

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