Convex-api-py

+ Add type hints for all the things
+ Rename `Address` method `is_address` to `has_address`
+ Move `convex_api.utils.is_address` to `Address` static method `is_address`
+ Move `convex_api.utils.to_address` to `Address` static method `to_address`
+ Move `convex_api.utils.is_public_key_hex` to `KeyPair` static method `is_public_key_hex`
+ Move `convex_api.utils.is_public_key` to `KeyPair` static method `is_public_key`
+ Move `convex_api.utils.to_public_key_checksum` to `KeyPair` static method `to_public_key_checksum`
+ Move `convex_api.utils.is_hexstr` to `KeyPair` static method `is_hexstr`
+ Move `convex_api.utils.add_0x_prefix` to `KeyPair` static method `add_0x_prefix`
+ Move `convex_api.utils.remove_0x_prefix` to `KeyPair` static method `remove_0x_prefix`
+ Move `convex_api.utils.to_bytes` to `KeyPair` static methods `to_bytes` for `data: bytes` argument use case and `to_` for `hexstr: string` argument use case
+ Move `convex_api.utils.to_hex` to `KeyPair` static method `to_hex`
+ Add pydantic dependency

+ Add cr, tab to contract text encoding

+ Rename contract 'register' to 'register_contract_name'

+ Add escape_string to Contract class, to escape string data

+ New Contract class, to allow for easier contract deployment and usage