port: MyAccount Password enrollment to v4

[pmathew92]

Summary

Ports the MyAccount Password enrollment feature (PR #1003 on main) into v4_development, following the established feature-by-feature port model.

Adds two-step password enrollment to MyAccountAPIClient:

• enrollPassword(userIdentity?, connection?) — POST /me/v1/authentication-methods with type=password, returns a PasswordEnrollmentChallenge (HTTP 202) carrying the connection's PasswordPolicy.
• verifyPassword(authenticationMethodId, authSession, newPassword) — POST /me/v1/authentication-methods/{id}/verify, returns a PasswordAuthenticationMethod (HTTP 201).

Changes

• New result/PasswordPolicy.kt — typed policy model (PasswordPolicy + PasswordComplexity/PasswordProfileData/PasswordHistory/PasswordDictionary).
• result/EnrollmentChallenge.kt — new PasswordEnrollmentChallenge subclass + policy discriminator branch in the polymorphic deserializer.
• myaccount/MyAccountAPIClient.kt — enrollPassword / verifyPassword methods (DPoP-aware, reusing the existing MyAccount DPoP plumbing) + new_password param key.
• Tests: 6 new cases in MyAccountAPIClientTest (payload, policy parsing, verify, DPoP header) plus mock-server helpers.
• EXAMPLES.md — "Enroll a Password Method" section + TOC entry.

Test plan

• ./gradlew :auth0:testDebugUnitTest --tests "com.auth0.android.myaccount.MyAccountAPIClientTest" — 42 tests green
• Full :auth0 suite — ./gradlew :auth0:testDebugUnitTest — all green, no regressions

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