feat: database backend add ssdb support

[goldendeng]

Change-Id: I054c5fc9b02f613601781de8613d684faa0ea7f2

Fixes #

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

Checklist

• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)
• man page updated (if applicable)
• bash completion updated (if applicable)
• documentation updated
• author name in AUTHORS

[codecov]

Codecov Report

Attention: Patch coverage is 71.24011% with 109 lines in your changes are missing coverage. Please review.

Project coverage is 66.42%. Comparing base (e90ac67) to head (9a668fd).
Report is 86 commits behind head on master.

Files	Patch %	Lines
database/ssdb/storage.go	64.60%	31 Missing and 9 partials ⚠️
database/ssdb/transaction.go	81.60%	19 Missing and 4 partials ⚠️
context/context.go	12.00%	20 Missing and 2 partials ⚠️
database/ssdb/database.go	55.55%	12 Missing and 4 partials ⚠️
database/ssdb/batch.go	93.42%	4 Missing and 1 partial ⚠️
database/ssdb/log.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1115      +/-   ##
==========================================
+ Coverage   66.31%   66.42%   +0.11%     
==========================================
  Files         141      146       +5     
  Lines       15910    16288     +378     
==========================================
+ Hits        10550    10819     +269     
- Misses       4610     4698      +88     
- Partials      750      771      +21     

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[neolynx]

See #1280