Add code snippets for credential transfer (import export API)

[vinishavathwani]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/CredentialTransfer.kt:41, tag android_identity_transfer_instantiation
• identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/CredentialTransfer.kt:45, tag android_identity_transfer_register
• identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/CredentialTransfer.kt:77, tag android_identity_transfer_export_activity
• identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/CredentialTransfer.kt:154, tag android_identity_transfer_import
• identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/CredentialTransfer.kt:198, tag android_identity_transfer_custom_wasm

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