chore: post handler size comparisons for non-fork PRs

[dphang]

Related: #1314. For fork/dependabot PRs it would need a bit additional work (i.e a locked down API to post the comment, etc.) and possibly doing some prettifying via a table, etc.

[codecov]

Codecov Report

Merging #1320 (8befa7f) into master (b962279) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1320   +/-   ##
=======================================
  Coverage   83.61%   83.61%           
=======================================
  Files          97       97           
  Lines        3345     3345           
  Branches     1001     1001           
=======================================
  Hits         2797     2797           
  Misses        486      486           
  Partials       62       62           

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[slsnextbot]

Handler Size Report

No changes to handler sizes.

Base Handler Sizes (kB) (commit b962279)

{
    "Lambda@Edge": {
        "Default Lambda": {
            "Standard": 1231,
            "Minified": 435
        },
        "API Lambda": {
            "Standard": 81,
            "Minified": 33
        },
        "Image Lambda": {
            "Standard": 903,
            "Minified": 357
        },
        "Regeneration Lambda": {
            "Standard": 629,
            "Minified": 223
        }
    }
}

New Handler Sizes (kB) (commit 8befa7f)

{
    "Lambda@Edge": {
        "Default Lambda": {
            "Standard": 1231,
            "Minified": 435
        },
        "API Lambda": {
            "Standard": 81,
            "Minified": 33
        },
        "Image Lambda": {
            "Standard": 903,
            "Minified": 357
        },
        "Regeneration Lambda": {
            "Standard": 629,
            "Minified": 223
        }
    }
}