Xamarin-macios: Similar to the work on `SecKey.GenerateKeyPair` we need to add a strong dictionary to `SecKey.CreateRandomKey`

[VincentDondain]

Steps to Reproduce

Here's the Swift code, here's the doc https://developer.apple.com/documentation/security/1823694-seckeycreaterandomkey.

guard
let aclObject = SecAccessControlCreateWithFlags(
    kCFAllocatorDefault,
    kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly,
    [.privateKeyUsage,.touchIDAny],
    nil
    ) else {
    print("could not create ACL error")
    return""
}


// private key parameters
let privateKeyParams: [String: AnyObject] = [
    kSecAttrAccessControl asString:    aclObject asAnyObject, //protect with touch id
    kSecAttrIsPermanent asString:      trueas AnyObject,
]


// global parameters for our key generation
let parameters: [String: AnyObject] = [
    kSecAttrTokenID asString:          kSecAttrTokenIDSecureEnclave,
    kSecAttrKeyType asString:          kSecMessECCKeyType,
    kSecAttrKeySizeInBits asString:    kSecMessECCKeySize asAnyObject,
    kSecAttrLabel asString:            kSecMessECCSignLabel asAnyObject,
    kSecPrivateKeyAttrs asString:      privateKeyParams asAnyObject
]


guard
let eCCPrivKey = SecKeyCreateRandomKey(parameters asCFDictionary, nil) else {
    print("ECC KeyGen Error!")
    return""
}

guard
let eCCPubKey = SecKeyCopyPublicKey(eCCPrivKey) else {
    print("ECC Pub KeyGen Error")
    return""
}

We currently don't have a way to do that because we didn't open the keys (they are [Internal]).

Expected Behavior

Similar to https://github.com/xamarin/xamarin-macios/pull/3438 we should have a strong dictionary based on the Apple documentation linked above to set those keys (with strong types).

Actual Behavior

We can't set the keys.

[mdbech]

As I have a stake in the matter I would like to do it.