Ability to remove JSON fields using JSONPath

[Vardhaman619]

This PR adds deletion capabilities to the jsonpath-rust crate by implementing delete_by_path() and delete_single() methods in the Queryable trait. #105

New Methods

• delete_by_path(path: &str) -> Result<usize, JsonPathError>
  • Deletes all elements matching the given JSONPath
  • Returns the number of elements successfully deleted
  • Handles complex queries with filters (e.g., $.users[?(@.age > 30)])
• delete_single(path: &str) -> Result<bool, JsonPathError>
  • Deletes a single element at the specified path
  • Returns true if an element was deleted, false otherwise
  • Optimized for simple, direct path deletions

Usage Examples

use serde_json::json;
use jsonpath_rust::JsonPath;

let mut data = json!({
    "users": [
        {"name": "Alice", "age": 30, "active": true},
        {"name": "Bob", "age": 25, "active": false},
        {"name": "Charlie", "age": 35, "active": true}
    ]
});

// Delete all inactive users
let deleted_count = data.delete_by_path("$.users[?(@.active == false)]")?;
assert_eq!(deleted_count, 1);

// Delete a specific array element
let deleted = data.delete_single("$.users[0]")?;
assert_eq!(deleted, true);

// Delete object fields
data.delete_by_path("$.users[*].age")?;

[besok]

First of all, thank you for the PR. I think it is gonna be usefull so let's try to merge it in.

[besok]

can be done in one seq

 deletions.sort_by(|a, b|
            b.path_depth().cmp(&a.path_depth()).then_with(|| {
                match (a, b) {
                    (
                        ArrayIndex { index: idx_a, .. },
                        ArrayIndex { index: idx_b, .. },
                    ) => idx_b.cmp(idx_a),
                    _ => std::cmp::Ordering::Equal,
                }
            })
        );

[besok]

What do you think would be the cases when this method is needed?
For now it throws exception if it does not get slice or index,

[besok]

added a couple of stylistic thinks to discuss

[besok]

thank you for the pr