Add visionOS support

[csjones]

Addresses #489

[what-the-diff]

PR Summary

• Adjustments to Object Identifier Values
  The values of 'idEcPublicKey,' 'domainComponent,' and 'emailAddress' in the 'ObjectIdentifier.swift' file have been modified. This impacts the way objects are identified within the system.

• Operating System Condition Updated
  The condition in 'Zeroization.swift' file now includes 'visionOS.' This extends the functionality to this specific operating system, ensuring that our service remains consistent across different platforms.

• Change in Count Value in Test File
  A modification has been done to the 'count' value in 'secp256k1Tests.swift.' This adjusts how many times our system runs tests in this particular section, which likely results in a more efficient testing process.