[Tech Request]: Fix the processing of hexadecimal literals

### Is there an existing issue for the same tech request?

- [X] I have checked the existing issues.

### Does this tech request not affect user experience?

- [X] This tech request doesn't affect user experience.

### What would you like to be added ?

The current implementation parses hexadecimal literals as a string with `isBin` flag. That flag is even passed to `Vector`.

It's a bug-prone and intrusive design. ~It causes the "double-binarization" bug in matrixorigin/MO-Cloud#2030.~

We should rewrite it in a better way. All hexadecimal literals should be recognized and stored as a hexnum `Literal` in the first place, then converted to unsigned integer or binary string according to the target type later. The `isBin` flag should to eliminated.

### Why is this needed ?

_No response_

### Additional information

_No response_