feat!: Add support for Google Cloud Functions and fastify-plugin

[simenandre]

This is quite a large pull request that adds 100% test coverage for two new methods; fastify-plugin and cloud functions. To improve readabilty, the server function changed from createPubSubHandler to createPubSubServer.

BREAKING CHANGES: createPubSubHandler changed to createPubSubServer

[codecov-commenter]

Codecov Report

Merging #9 (543b902) into main (f9fb7cf) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         6    +5     
  Lines           22        49   +27     
  Branches         6        10    +4     
=========================================
+ Hits            22        49   +27     

Impacted Files	Coverage Δ
src/common.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/methods/cloud-functions.ts	100.00% <100.00%> (ø)
src/methods/fastify-plugin.ts	100.00% <100.00%> (ø)
src/methods/server.ts	100.00% <100.00%> (ø)
src/types.ts	100.00% <100.00%> (ø)
... and 1 more

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