fix: add explicit module declaration to type definitions

[jstarry]

Problem

The generated typescript declarations are not prioritized over ambient module declarations in a project's transitive dependencies. This causes strange type errors because the wrong type declaration is resolved for web3

Summary of Changes

• Wrap type declaration in module declaration

Fixes #16207

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #16219 (3476e90) into master (ba377b7) will decrease coverage by 9.5%.
The diff coverage is n/a.

❗ Current head 3476e90 differs from pull request most recent head f02cb70. Consider uploading reports for the commit f02cb70 to get more accurate results

@@             Coverage Diff             @@
##           master   #16219       +/-   ##
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- Coverage    80.0%    70.4%     -9.6%     
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  Files         410       28      -382     
  Lines      109501     1735   -107766     
  Branches        0      227      +227     
===========================================
- Hits        87695     1223    -86472     
+ Misses      21806      428    -21378     
- Partials        0       84       +84