feat: update index.d.ts

[qingdengyue]

Checklist

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

Affected core subsystem(s)

No affected core subsystem(s)

Description of change

index.d.ts add plugins loadModel app agent types

[codecov]

Codecov Report

Merging #46 (0815114) into master (123527c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #46   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           63        63           
=========================================
  Hits            63        63           

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