Tag Lambda functions with macro version

[Czechh]

What does this PR do?

With this change we tag the lambda functions built with the macro with the version used. This will allow us to get some usage tracking and help debug issues.

Motivation

This change is part of the telemetry/usage OKR

Testing Guidelines

• Unit tests
• Manual changes using SAM.

Additional Notes

Types of changes

• [ ] Bug fix
• [X] New feature
• [ ] Breaking change
• [] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [X] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [X] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

Merging #10 into master will increase coverage by 0.33%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   87.31%   87.64%   +0.33%     
==========================================
  Files           7        7              
  Lines         331      340       +9     
  Branches       77       79       +2     
==========================================
+ Hits          289      298       +9     
  Misses         21       21              
  Partials       21       21              

Impacted Files	Coverage Δ
serverless/src/index.ts	90.19% <100.00%> (+0.40%)	:arrow_up:
serverless/src/tags.ts	100.00% <100.00%> (ø)

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