Python-jsonpath

**Fixes**

- Fixed evaluation of JSONPath singular queries when they appear in a logical expression and without a comparison operator. Previously we were evaluating logical expressions with the value held by the single element node list, now we treat such filter queries as existence tests. See [57](https://github.com/jg-rp/python-jsonpath/issues/57).

**Fixes**

- Fixed logical operator precedence in JSONPath filter expressions. Previously, logical _or_ (`||`) and logical _and_ (`&&`) had equal precedence. Now `&&` binds more tightly than `||`, as per RFC 9535.
- Fixed JSONPath bracketed selector list evaluation order. Previously we were iterating nodes for every list item, now we exhaust all matches for the first item before moving on to the next item.

**Features**

- Added the "query API", a fluent, chainable interface for manipulating `JSONPathMatch` iterators ([docs](https://jg-rp.github.io/python-jsonpath/query/), [source](https://github.com/jg-rp/python-jsonpath/blob/7665105de1501a5b2172f63a88db6d08b2b1702d/jsonpath/fluent_api.py#L17)).

[RFC 9535](https://datatracker.ietf.org/doc/html/rfc9535) (JSONPath: Query Expressions for JSON) is now out, replacing the [draft IETF JSONPath base](https://datatracker.ietf.org/doc/html/draft-ietf-jsonpath-base-21).

**Breaking Changes**

- The undocumented `keys` function extension is no longer enabled by default. A new, well-typed `keys` function is planned for the future.

**Fixes**

- The lexer now sorts environment-controlled tokens by their length in descending order. This allows one custom token to be a prefix of another.

**Features**

- Added the non-standard "fake root" identifier, which defaults to `^` and can be customized with the `fake_root_token` attribute on a `JSONPathEnvironment` subclass. Using the fake root identifier is equivalent to the standard root identifier (`$`), but wraps the target JSON value in an array, so the root value can be conditionally selected using a filter.
- Non-standard environment-controlled tokens can now be disabled by setting them to the empty string.

**Breaking Changes**

- Changed the exception raised when attempting to compare a non-singular filter query from `JSONPathSyntaxError` to `JSONPathTypeError`.

**Fixes**

- Fixed handling of relative and root queries when used as arguments to filter functions. Previously, when those queries resulted in an empty node list, we were converting them to an empty regular list before passing it to functions that accept _ValueType_ arguments. Now, in such cases, we convert empty node lists to the special result _Nothing_, which is required by the spec.
- Fixed well-typedness checks on JSONPath logical expressions (those that involve `&&` or `||`) and non-singular filter queries. Previously we were erroneously applying the checks for comparison expressions to logical expressions too. Now non-singular queries in logical expressions act as an existence test. See [45] (https://github.com/jg-rp/python-jsonpath/issues/45).

**Fixes**

- Fixed precedence of the logical not operator in JSONPath filter expressions. Previously, logical _or_ and logical _and_ had priority over _not_. See [41](https://github.com/jg-rp/python-jsonpath/issues/41).

**Hot fix**

- Fixed priority of JSONPath lexer rules. Previously, standard short tokens (like `*` and `?`) had a higher priority than environment-controlled tokens (like `JSONPathEnvironment.keys_selector_token`), making it impossible to incorporate short token characters into longer environment-controlled tokens.