Add Recipe and Recipe Collection Lexicons

[jhuckabee]

This PR introduces two new lexicons for sharing recipes on the AT Protocol:

• community.lexicon.recipes.recipe: A schema for individual recipes
• community.lexicon.recipes.collection: A schema for organizing recipes into collections

A version of these lexicons is currently in production use at recipe.exchange.

The recipe schema is heavily inspired by Schema.org's Recipe type with two notable distinctions:

1. Custom attribution properties to clearly denote recipe authorship and licensing
2. Multi-image support using the same pattern as app.bsky.feed.post

The recipe lexicon currently reuses app.bsky.embed.defs#aspectRatio for image handling. However, I suspect this may warrant redefinition within the community lexicon. I’m eager to hear others’ thoughts on this.

Examples of usage are provided in the README.

License and Assignment

• I assign all rights of this contribution to Lexicon Community as an open source contribution under the MIT license.

[ebwinters]

This is great to see! Also interesting to read through having used recipe exchange.

Personally I don't see a reason to re-define aspect ratio in this repo. The events lexicon uses a com.atproto.strongRef, but we don't re-define that. Might make more sense if we were defining it within the context of a community image lexicon. There might be another limitation or design considering I'm not thinking of

[verdverm]

Some initial thoughts from a brief look:

1. each step or instruction as a rich text would be helpful, so one could show media (image,video) during the process
2. string fields should include a maxGraphemes to support international languages
3. I'm still unclear about tokens being in a def vs separate lexicon. I've seen both, the theory for the latter is that tokens can be add/del without changes to the primary lexicon that uses or references them

A more general comment, are recipes a lexicon that even belongs in a shared repository / namespace? This seems very application specific. What sorts of guidelines do we have around they types or content of lexicon that belong here?

[snarfed]

Microformats2's h-recipe (and its predecessor hRecipe) are also prior art here.