Refactor koishi-test-utils

[shigma]

No description provided.

[codecov]

Codecov Report

Merging #98 into develop will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #98      +/-   ##
===========================================
+ Coverage    90.21%   90.23%   +0.02%     
===========================================
  Files           48       47       -1     
  Lines         7306     7221      -85     
  Branches      1539     1532       -7     
===========================================
- Hits          6591     6516      -75     
+ Misses         715      705      -10     

Impacted Files	Coverage Δ
packages/koishi-core/src/database.ts	100.00% <100.00%> (ø)
packages/koishi-test-utils/chai/src/index.ts	100.00% <100.00%> (ø)
packages/koishi-test-utils/src/database.ts	100.00% <100.00%> (ø)
packages/koishi-test-utils/src/index.ts	100.00% <100.00%> (ø)
packages/koishi-test-utils/src/memory.ts	100.00% <100.00%> (ø)

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