Add ability to describe tool parameters via `#[ToolParameter]` attribute

[OskarStark]

Todo

validate, that this is not allowed:

#[ToolParameter(const: 'my-string')]
int $number

[chr-hertel]

i guess i would prefer PhpLlm\LlmChain\Attribute\ToolParameter 🤔 but with explicit arguments like you did, e.g. pattern: ... or minItems: 5 etc

and i think it would be great to consider all the standardized cases: see https://json-schema.org/draft/2019-09/json-schema-validation#rfc.section.6

[OskarStark]

and i think it would be great to consider all the standardized cases:

In this case it would be good to a) map the type, so that pattern can only be used if it is a string or define the type, but that would double the noise.

[chr-hertel]

Nice one :muscle:

[OskarStark]

Nice one 💪

Tough one