Stac-pydantic

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- Allow extra fields in Links (144, jonhealy1)
- Remove the deprecated `Context` extension (138, vincentsarago)
- Rename `stac_pydantic.api.conformance.ConformanceClasses` to `stac_pydantic.api.conformance.Conformance`
- Update pre-commit configuration and switch to astral-sh/ruff for linter and formater
- Add official support for python 3.12
- Enforce required `type` key for `Collection` and `Catalog` models
- Add queryables link relation type (123, constantinius)
- Fix STAC API Query Extension operator names from ne->neq, le->lte, and ge->gte (120, philvarner)
- Better **datetime** parsing/validation by using Pydantic native types and remove `ciso8601` requirement (131, eseglem)
- move datetime validation in `StacCommonMetadata` model definition (131, eseglem)
- use `StacBaseModel` as base model for `Asset` model (148, vincentsarago)
- add `license` in `StacCommonMetadata` model (147, vincentsarago)
- make `limit` optional in `api.Search` model (150, vincentsarago)
- set `start/end datetime` to the datetime value when passing only one value in `api.Search` (152, vincentsarago)

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- Support pydantic>2.0 (huard)

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- Allow item bbox to be null if item geometry is null (108, yellowcap)
- Include 'children' link relation (112, moradology)

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- Remove fields added by STAC API search extensions (100, rsmith013 & moradology)
- Add ExtendedSearch class with fields from STAC API search extensions (100, rsmith013 & moradology)
- Allow for non-ellipsis open temporal windows (103, moradology)
- Add the canonical and service-doc relation types (104, moradology)

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- Add bbox validator to STAC search (95, geospatialjeff)
- Fix LandPage to make valid STAC 1.0 catalog (96, lossyrob)

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- Add Collections model (81, moradology)
- Update to stac version 1.0.0 (86, moradology)
- Remove models for STAC spec extensions (86, moradology)
- Add conformsTo to LandingPage (90, moradology)