[KeyVault] - Address KeyVault feedback

[maorleger]

What

• Hide various parse identifier methods
• Make additionalAuthenticatedData readonly

Why

These came out of the recent KV architecture review. I spoke to @sadasant and
made sure that the other tasks are not applicable to us

Callouts

The only thing I wasn't sure about is renaming EncryptOptions to EncryptParameters since I
think we already GA'd with EncryptOptions - should I add a new EncryptParameters where iv and aad
are set?

Partially resolves #13237

[sadasant]

Looks good to me! Very concise.

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[maorleger]

/check-enforcer override

• Previous commit passed all checks
• This commit only adds a CHANGELOG entry
• There's a known issue with check enforcer at this time