Schema for validating malli vector/map/lite syntax

[zerg000000]

It would be nice to have a schema of malli vector/map/lite syntax. Since

• it provides a better error message when we define malli schema, currently, we get a ":malli.core/invalid-schema"
• user could check their schema before actually using it programmatically
• open the possibility of clj-kondo checking?
• Itself is a complete test suite/example of the malli capability
• A specification of the syntax

[ikitommi]

Agree. Resolution for vector-syntax is resolved with:

• https://github.com/metosin/malli/issues/269
• https://github.com/metosin/malli/issues/270

need to figure out how to create schema definitions without too much duplicaition (ast vs vector vs lite).