Handle INT64_MIN edge case in EncodeInt/DecodeInt

[JyotinderSingh]

The current implementation of EncodeInt and DecodeInt may not correctly handle the minimum 64-bit integer value due to potential overflow in two's complement arithmetic. We need to add a specific test case for this value and ensure correct behavior.
Tasks:

Requirements

• Add a test case for INT64_MIN in int_test.go
• Verify correct encoding and decoding of INT64_MIN
• If issues are found, implement a fix in EncodeInt and/or DecodeInt functions

[Vsareen0]

Hey @JyotinderSingh I would like to pick this.

[JyotinderSingh]

Hey @JyotinderSingh I would like to pick this.

Assigned.