Bug: `PyYAML` cannot correct parse `asyncapi.yaml`

[chirizxc]

Description

Starting with v0.6.0 faststream supports AsyncAPI 3.0.

The AsyncAPI 3.0 documentation states:

In order to preserve the ability to round-trip between YAML and JSON formats, YAML version 1.2 is recommended along with some additional constraints:

• Tags MUST be limited to those allowed by the JSON Schema ruleset
• Keys used in YAML maps MUST be limited to a scalar string, as defined by the YAML Failsafe schema ruleset

Note: AsyncAPI use js-yaml as parser, *js-yaml playground

According to spec, yaml of the following type:

protocolVersion: ! "3.2"

should be converted to {protocolVersion: "3.2"}, i.e. to a string, but PyYAML converts it to an float:

import yaml

y = "protocolVersion: ! '3.2'"

print(yaml.safe_load(y))  # {'protocolVersion': 3.2}
print(type(yaml.safe_load(y)["protocolVersion"]))  # <class 'float'>

faststream/faststream/_internal/cli/utils/logs.py

Lines 97 to 106 in 6050ba3

	def _get_yaml_config(file: Path) -> dict[str, Any] | Any:
	"""Parse yaml config file to dict."""
	try:
	import yaml
	except ImportError as e:
	typer.echo(INSTALL_YAML, err=True)
	raise typer.Exit(1) from e
	with file.open("r", encoding="utf-8") as config_file:
	return yaml.safe_load(config_file)

(Also, PyYAML does not fully support YAML v1.2.* and does not pass the official yaml-test-suite).

Valid AsyncAPI config: https://studio.asyncapi.com/?share=851921b7-91cd-414c-9438-e94876953c0d

but faststream cannot load it

❯ faststream docs serve asyncapi.yaml                                                                                                                 
`asyncapi.yaml` not supported. Make sure that your schema is valid and schema version supported by FastStream

Proposal: make it plug-able so that the user can use any parser through the interface.

(Also we need improve error message; right now it's unclear. It needs to clearly show whether it's a parsing error or a pydantic validation error.)