Improve keymap json schema (#23044)

Also:

* Adds `impl_internal_actions!` for deriving the `Action` trait without
registering.

* Removes some deserializers that immediately fail in favor of
`#[serde(skip)]` on fields where they were used. This also omits them
from the schema.

Release Notes:

- Keymap settings file now has more JSON schema information to inform
`json-language-server` completions and info, particularly for actions
that take input.

crates/vim/src/surrounds.rs

@@ -6,7 +6,7 @@ use crate::{
 };
 use editor::{movement, scroll::Autoscroll, Bias};
 use language::BracketPair;
-use serde::Deserialize;
+
 use std::sync::Arc;
 use ui::ViewContext;
 
@@ -17,16 +17,6 @@ pub enum SurroundsType {
     Selection,
 }
 
-// This exists so that we can have Deserialize on Operators, but not on Motions.
-impl<'de> Deserialize<'de> for SurroundsType {
-    fn deserialize<D>(_: D) -> Result<Self, D::Error>
-    where
-        D: serde::Deserializer<'de>,
-    {
-        Err(serde::de::Error::custom("Cannot deserialize SurroundsType"))
-    }
-}
-
 impl Vim {
     pub fn add_surrounds(
         &mut self,