Enable Optional inputs in CrewAI adapter

[electrocucaracha]

The current CrewAI adapter implementation requires passing all the values for arguments that don't have a default value, but fails when the MCP tool provides an optional argument. For example, the following code:

@mcp.tool()
def echo_tool(
    id: int | float | None,
    text: str = Field(description="The text to echo"),
) -> str:
    pass

Results in the following error

starting echo server
[06/11/25 18:23:31] INFO     Processing request of type ListToolsRequest                                                                                                                                                                                                                                      server.py:551
                    INFO     Processing request of type ListToolsRequest                                                                                                                                                                                                                                      server.py:551
[CrewAIMCPTool(name='echo_tool', description="Tool Name: echo_tool\nTool Arguments: {'properties': {'id': {'anyOf': [{'type': 'integer'}, {'type': 'number'}, {'type': 'null'}], 'description': '', 'enum': None, 'items': None, 'properties': {}, 'title': 'Id'}, 'text': {'anyOf': [], 'description': 'The text to echo', 'enum': None, 'items': None, 'properties': {}, 'title': 'Text', 'type': 'string'}}, 'required': ['id', 'text'], 'title': 'echo_toolArguments', 'type': 'object'}\nTool Description: Echo the input text\n\n    Args:\n        id (int|float|None): (Optional) Id\n        text (str): The text to echo\n\n    Returns:\n        str: The echoed text\n    ", args_schema=<class 'mcpadapt.utils.modeling.echo_toolArguments'>, description_updated=False, cache_function=<function BaseTool.<lambda> at 0x108f2d5a0>, result_as_answer=False)]
Using Tool: echo_tool
                    INFO     Processing request of type CallToolRequest                                                                                                                                                                                                                                       server.py:551
Error executing tool echo_tool: 1 validation error for echo_toolArguments
id
  Field required [type=missing, input_value={'text': 'hello'}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.11/v/missing

When the tool doesn't provide an id value, like tools[0].run(text="hello")

This change modifies the way to populate filtered_kwargs variable utilizing the schema_properties values instead of the kwargs

[electrocucaracha]

Duplicated #53 #54