Blacksmith

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* Update the nomad service discovery for versionned service.
Now the version is added in the environment variable by default.
All the service and url are configurable.

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* Add support of nomad for service discovery.
See :class:`blacksmith.AsyncNomadDiscovery` - contrib from gdchamal

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* Drop support of python 3.7, add support of python 3.12
* Remove the deprecated result.response property replaced by result.unwrap()
* Drop support of pydantic 1

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* Fix small typing issue

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* Small fix for type Url with pydantic 2

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* Add a way to support multiple serialization format, more than json.
In this release, support of ``application/x-www-form-urlencoded`` is
natively support. A new abstract class
:class:`blacksmith.AbstractHttpBodySerializer` is available to handle
new kind of serialization format.
The function :func:`blacksmith.register_http_body_serializer` has been
added to register new format.