[Auth] Add SAML provider to the compat layer

[sam-gc]

Fixes b/204777785

[changeset-bot]

🦋 Changeset detected

Latest commit: a11208c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@firebase/auth-compat	Patch
@firebase/auth	Patch
firebase	Patch

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[google-oss-bot]

Binary Size Report

Affected SDKs

• @firebase/auth-compat

  Type	Base (477bdef)	Head (7b55cd5)	Diff
  browser	19.7 kB	19.8 kB	+38 B (+0.2%)
  esm5	26.6 kB	26.6 kB	+38 B (+0.1%)
  main	29.1 kB	29.1 kB	+49 B (+0.2%)
  module	19.7 kB	19.8 kB	+38 B (+0.2%)

• firebase

  Type	Base (477bdef)	Head (7b55cd5)	Diff
  firebase-auth-compat.js	122 kB	123 kB	+534 B (+0.4%)
  firebase-compat.js	751 kB	751 kB	+536 B (+0.1%)

Test Logs

• Base (477bdef1): https://github.com/firebase/firebase-js-sdk/actions/runs/1408892820
• Head (7b55cd54): https://github.com/firebase/firebase-js-sdk/actions/runs/1409067554

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (477bdef) and head commit (7b55cd5).

Test Logs

• Base (477bdef): https://github.com/firebase/firebase-js-sdk/actions/runs/1408892820
• Head (7b55cd5): https://github.com/firebase/firebase-js-sdk/actions/runs/1409067554