[REFACTOR] JsonInjector and NetworkDeserializer classes

[AKakkar28]

refactor: improve JsonInjector and NetworkDeserializer for clarity, safety and added JUnit tests as well

• Replaced conditional chain in JsonInjector with precomputed injectable map and reused Traits object.
• Added input validation and specific exceptions in NetworkDeserializer, including prefix length checks.
• Extracted CIDR parsing logic into a helper method for better readability.
• Added comprehensive JUnit tests for both JsonInjector and NetworkDeserializer, including edge cases and error handling.
• Fixed NetworkDeserializer tests to compare network properties instead of object equality.

@horgh
These are my changes can you please review these and approve if everything looks good?
I have added test cases, made sure the build passes and not used lightweight prefix validation.

Thanks!

[AKakkar28]

@horgh does this look good?

[horgh]

Hi @AKakkar28! Sorry I haven't had time to look at this fully yet. However while reviewing it I noticed that JsonInjector was mostly not used (note how we pass the second two parameters as null in the only use). So I made #608 to remove it. Thanks for helping us notice that! You'll need to rebase to incorporate that removal though.

[AKakkar28]

@horgh I see got it. I have rebased and now this PR focuses on validating CIDR format and prefix (IPv4: 0–32, IPv6: 0–128)
and extracts parsing helper and adds unit tests for valid inputs.

[horgh]

Looks good! Thanks for the tests!

I have a couple minor comments.

[AKakkar28]

@horgh Done and I updated the test as well. Please review and approve it.
Thanks.

[horgh]

Thanks!