Add option to export raw JSON Schema files

[uint]

Thanks to @hashedone for pointing this out. Apparently raw JSON schema (without our custom metadata and structure) files are useful for IDEs - they help people write valid JSON msgs by hand.

[webmaster128]

How are those individual JSON schemas used? The user has to manually move them somewhere anyways, right? What if we generate them by default (maybe to a sub-folder) and then the user can choose to use or ignore them.

I would like to avoid the library code trying to make assumtions on how the binary it is called from works (as noted in #1478).

[uint]

How are those individual JSON schemas used?

As far as I understand, if someone needs to write e.g. an execute msg by hand, they take the ExecuteMsg schema, put that in their IDE, and then their IDE helps them write the msg correctly.

What if we generate them by default (maybe to a sub-folder)

I'd be okay with that