Remove mesh-provider from code base

[nichtich]

requires gbv/cocoda-sdk#92

[kespera]

cocoda-sdk/issues/92 is done.

[nichtich]

This works in cocoda-sdk >= 3.8.3 so should be doable now to integrate into Cocoda:

import { providers } from "../src/index.js"

const provider = new providers.MeshApiProvider({
    endpoint: "https://id.nlm.nih.gov/mesh/sparql"
})

// get terminology
const [scheme] = await provider.getSchemes()
console.log(scheme.prefLabel.en)

// look up an individual concept
const concepts = await provider.getConcepts({ concepts: [
    { uri:"http://id.nlm.nih.gov/mesh/C522534" }
]})

// search suggest
const search = "palmerolide"
console.log(await provider.suggest({ scheme, search }))

Test by selecting MeSH terminology, and performing a search for "palmerolide".