Tracker - Replace encryption/decryption/key generation logic with at_chops

[murali-shris]

Describe the bug

Tracker for replacing all encryption/decryption/key generation logic with at_chops impl

Steps to reproduce

n/a

Expected behavior

• no references to EncryptionUtil, EncryptionService in SDK/libraries

Screenshots

No response

Smartphones

No response

Were you using an atApplication when the bug was found?

No response

Additional context

No response

[murali-shris]

• deprecate useAtChops flag in atclient preference #1141
• replace encryption util methods with at_chops #1145
• replace encryption methods in at stream transfer with at_chops #1146
• at_chops - upgrade dependencies and modify example at_libraries#429
• at_chops implement RSA 4096 and ed25519 algorithms at_libraries#435
• at_chops - get keypair/key object based on keyname at_libraries#436

[murali-shris]

Below issue has to be part of major version release in at_lookup

• remove privateKey references from at_lookup_impl and enforce at_chops at_libraries#434