fix: typings of config, for multi cluster clients

[taosher]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

index.d.ts

Description of change

multi cluster clients的类型支持

[codecov]

Codecov Report

Merging #32 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   84.09%   84.09%           
=======================================
  Files           4        4           
  Lines          44       44           
=======================================
  Hits           37       37           
  Misses          7        7           

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[taosher]

@whxaxes any updates?

[whxaxes]

在 app/fixtures/apps/ts 里加相关 test case 看看