Updated Ypy API for new Yrs version

[Waidhoferj]

Updated libraries and adapted Ypy API to be more Pythonic. The goal of the latter is to make Y types as interoperable as possible with native Python data structures without causing confusion.

Changes

Package Updates

• Updated PyO3 to 0.16.2
• Updated Yrs to 0.5.0

Rust Ypy methods:

• Added trait Iterator to several internal type iterators for clarity
• Took out YTransaction argument for all read-only functions.

YArray

Added native support for:

• Iteration: [el for el in y_array]
• Contains: el in y_array
• Number indexing: y_array[0]
• Range indexing: y_array[1:3]
• String [1,2,3] and Repr YArray([1,2,3]) outputs for printing.
• Length operator len(y_array)

YMap

• Key Iteration: [key for key in y_map]
• Key/Value iteration changed from entries() to items() to match Python dictionary API
• Contains: key in y_map
• Key indexing: y_map["key"]
• String {"key": "value"} and Repr YMap({"key": "value"}) outputs for printing.
• Length operator len(y_map)

YText

• Character Iteration: [c for c in y_text]
• Contains: substring in y_text
• String "hello" and Repr YText("hello") outputs for printing.
• Length operator len(y_text)

I recommend adding character and range indexing in another PR. The other option would just be converting first and then operating on the string:

# with direct indexing
y_text[0:3] # does string casting and iteration internally

# Using the str method instead
string = str(y_text)
string[0:3]

YXml Types

Made the following methods into getters:

• first_child: Optional[Xml]
• next_sibling: Optional[Xml]
• prev_sibling: Optional[Xml]
• parent: Optional[YXmlElement]

Added String an Repr methods similar to the ones above.

Testing

Updated tests to handle new functionality

Documentation

Updated docstrings and type hints for all methods