Adds support for GPT-5 series of models in `arcade docs`.
Improves error handling when the LLM does not generate a valid JSON for
a given tool sample inputs. Instead of raising an exception, the CLI
uses an empty input, moves on to the next tool, and prints a warning
message asking the user the fill in the input sample manually in
Javascript and Python files.
This PR also moves the Enumerations from a separate `reference.mdx` file
to the main toolkit file, as requested by @EricGustin to simplify the
docs structure.
Display "This tool does not take any parameters." when the tool
interface has no arguments other than context.
Prevent the same Enum from being referenced multiple times in the
reference.mdx file.
