[enhance]: Optimize IPv4 address conversion by using bitwise operations

### 👀 Is there an existing feature request for this?

- [x] I have searched the existing issues

### 🔖 Enhancement description

Currently, `/keploy/pkg/agent/proxy/util/util.go` use string manipulation or `strconv` parsing to convert uint32 IP addresses into their dot-decimal string representation. This involves unnecessary overhead from string allocations and multiple parsing steps.

I propose standardizing this functionality to use bitwise shifting and masking. This approach is more idiomatic in Go for networking tasks and significantly improves performance by utilizing CPU-native operations.

### Current and enhanced results

### 🎤 Why should this be worked on?

- **Performance**: Bitwise operations are significantly faster than string formatting and parsing.
- **Memory Efficiency**: It reduces the number of temporary string allocations, which minimizes Garbage Collector (GC) pressure in high-traffic scenarios.
- **Code Quality**: This follows industry standards for systems programming and networking in Go, making the codebase more professional and easier for other engineers to maintain.
- **Reliability**: It eliminates the risks associated with manual string slicing and index-based errors.

## I want to raise a PR on this issue.

### 💻 Repository

keploy

Start in /keploy/pkg/agent/proxy/util/util.go and inspect the existing uint32 IPv4 conversion path. Replace the string or strconv-based conversion with the proposed bitwise approach, then verify that the output remains the same dot-decimal IPv4 representation and that the conversion avoids unnecessary parsing and allocations.

Written by the indexing model from the issue text.