Function normalizeStreamId

Normalizes a stream ID to ensure it is valid, generating a random ID if needed.

For string inputs:

• Returns the input if it's a valid 32-character hexadecimal string (case-insensitive)
• Otherwise, generates a new random hexadecimal string using randomString()

For number inputs:

• Returns the input if it's a finite, non-negative integer within the safe integer range
• Otherwise, generates a new random integer using randomInteger()

For null or undefined inputs:

• Generates a new random hexadecimal string using randomString()