Allow to write tool specification file in yaml

[candoumbe]

Description

I propose to add the possibility to write specification files using yaml.
This is because some help text can be very long and json does not support multiple lines for a string (at least I did not found a way to do it 😞 ).

That feature would ease the process of writing tool specification file as we could easily see the whole description and format it as we like.

Usage Example

No response

Alternative

No response

Could you help with a pull-request?

Yes