Koda-validate

**Features**
- Derived Validators: `TypedDictValidator`, `DataclassValidator`, `NamedTupleValidator`
- `UnionValidator` replaces `OneOf2`, `OneOf3`
- `NTupleValidator` replaces `Tuple2Validator`, `Tuple2Validator`
- `UniformTupleValidator`
- `SetValidator`
- `BytesValidator`
- New `Valid`/`Invalid` types
- `MaybeValidator`
- `CacheValidatorBase`
- Errors decoupled from Serialization
- Fewer Generic Arguments needed for `Validator`s, `Predicate`s and `PrediateAsync`s
- `koda_validate.serialization.to_json_schema`

**Removals**
- `OneOf2`
- `OneOf3`
- `Tuple2Validator`
- `Tuple3Validator`

**Breaking Changes**
- `UnionValidator` replaces `OneOf2`, `OneOf3`
- `NTupleValidator` replaces `Tuple2Validator`, `Tuple2Validator`
- New `Valid`/`Invalid` types -- need `koda_validate.to_serializable_errs` to produce serializable errors

**Performance**
- Various optimizations in dictionary `Validator`s
- Optimizations in scalar validators (StringValidator, IntValidator, etc.) for common use cases
- Overall speedups of around 30% for common validation cases
- More benchmarks

**Maintenance**
- New Docs Site
- Restructure project layout
- _internal.py
- move serialization to koda_validate.serialization
- More benchmarks

**Features**
- `UUIDValidator`

**Bug Fixes**
- `RecordValidator` allows up-to-16 keys as intended

**Performance**
- Small optimizations for `RecordValidator`, `DictValidatorAny`, `ListValidator` and `DecimalValidator`

**Features**
- `asyncio` is supported with `.validate_async` method
- `PredicateAsync` is added
- `RecordValidator` (and `DictValidatorAny`) can now handle any kind of dict key.
- `AlwaysValid` is added
- `Predicate`s and `Processor`s are allowed more extensively across built-in validators.


**Performance**
- speed has improved as much as 60x (Koda Validate is now significantly faster than Pydantic)

**Breaking Changes**
- `Ok` / `Err` / `Result` (from `koda`) -> `Valid` / `Invalid` / `Result` (from `koda_validate`)
- `dict_validator` -> `RecordValidator`
- `DictNKeysValidator`s are removed. Instead, `RecordValidator` is used.
- `RecordValidator` requires all arguments as keyword-only
- `RecordValidator` accepts up-to 16 keys
- `key` helper is removed
- `maybe_key` helper is replaced by `KeyNotRequired`
- `MapValidator` requires all arguments as keyword-only
- `ListValidator` requires `Predicate`s to be specified as a keyword argument
- the order and number of some `__match_args__` has changed
- most validators are not longer dataclasses; `__repr__`s may differ
- `validate_and_map` is deprecated and removed from `koda_validate` imports.
- file structure has changed
- typedefs.py -> base.py
- utils.py -> _internals.py

**Maintenance**
- `bench` folder is added for benchmarks
- `python3.11` added to CI
- `pypy3.9` added to CI
- min coverage bumped to 95%
- lots of tests added

:)