Support multiple buildpack apis simultaneously.

[matthewmcnew]

• Supports multiple buildpack apis from buildpack rfc: https://github.com/buildpacks/rfcs/blob/main/text/0041-api-version-compat.md
• Includes multi-api lifecycle descriptor Multi-API lifecycle descriptor buildpacks/lifecycle#344
• go mod tidy

[codecov-commenter]

Codecov Report

Merging #487 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #487   +/-   ##
=======================================
  Coverage   67.59%   67.59%           
=======================================
  Files          74       74           
  Lines        3419     3419           
=======================================
  Hits         2311     2311           
  Misses        837      837           
  Partials      271      271           

Impacted Files	Coverage Δ
pkg/cnb/builder_builder.go	84.31% <100.00%> (ø)
pkg/cnb/buildpack_validation.go	100.00% <100.00%> (ø)

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