fix: make UserConfig interface instead of type

[jacobinu]

Fixes #661

Similar problems with exporting a type alias:

• type export issue microsoft/TypeScript#23280 (comment)
• XXX has or is using name 'Foo' from external module "../bar" but cannot be named microsoft/TypeScript#9944 (comment)

Seems like this is intentional, explanation can be found here: privatenumber/cleye#11 (comment)

Should we want createClient and defineConfig to take an array we can just make the parameter config type UserConfig | ReadonlyArray<UserConfig>.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.15%. Comparing base (df9c928) to head (bc78a42).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #989   +/-   ##
=======================================
  Coverage   76.15%   76.15%           
=======================================
  Files          89       89           
  Lines       10953    10953           
  Branches     1111     1111           
=======================================
  Hits         8341     8341           
  Misses       2605     2605           
  Partials        7        7           

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