feat: action mods (+ tipping example)

[stephancill]

Change Summary

This PR adds a new mod type called Action Mods, which are triggered by post content. It includes a tipping mod which is of this new type.

Further ideas:

• onSetInput and onAddEmbed callbacks should apply to the reply of the post being called on
• onSetPostContent - a callback for modifying post content (this can be done by adding a section for modifications by the Mod)

Merge Checklist

• PR has a changeset
• PR includes documentation if necessary
• PR updates the rich-embed examples if necessary
• includes a parallel PR for Mod-starter and the gateway if necessary

[changeset-bot]

🦋 Changeset detected

Latest commit: 6b703fa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@mod-protocol/react-ui-shadcn	Patch
@mod-protocol/mod-registry	Minor
@mod-protocol/core	Patch
web	Patch

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Name	Status	Preview	Comments	Updated (UTC)
api	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 24, 2024 11:07am
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 24, 2024 11:07am
example-nextjs-shadcn	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 24, 2024 11:07am