refactor(typescript): noImplicityAny for index.ts

[praveenqlogic]

Fixes #313 (it's a good idea to open an issue first for discussion)

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[praveenqlogic]

locally both ('should get a list of snapshots','should get a list of snapshots as a stream') test case is passing.

[JustinBeckwith]

👋 @callmehiphop looks like another potential case of a flake

[codecov]

Codecov Report

Merging #482 into master will decrease coverage by 0.25%.
The diff coverage is 91.17%.

@@            Coverage Diff             @@
##           master     #482      +/-   ##
==========================================
- Coverage   95.11%   94.85%   -0.26%     
==========================================
  Files          15       15              
  Lines         982      991       +9     
  Branches       73       83      +10     
==========================================
+ Hits          934      940       +6     
  Misses         43       43              
- Partials        5        8       +3

Impacted Files	Coverage Δ
src/message-stream.ts	100% <ø> (ø)	⬆️
src/index.ts	100% <100%> (ø)	⬆️
src/message-queues.ts	100% <100%> (ø)	⬆️
src/topic.ts	91.86% <62.5%> (-3.14%)	⬇️

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