Include the schema in the provider

[justinvp]

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Issue details

The schema should be packaged up and included in the provider to make it available from the provider's GetSchema method.

This can be done by setting an optional string schema property that's defined on the Provider interface.

I suspect we'd implement this in a similar way to how the provider's version is set: Include the schema.json file in the NPM package, and then at runtime read it the same way we read package.json to get the version:

pulumi-component-provider-ts-boilerplate/provider/cmd/pulumi-resource-xyz/index.ts

Lines 20 to 26 in a0aad2c

	let version: string = require("./package.json").version;
	// Node allows for the version to be prefixed by a "v",
	// while semver doesn't. If there is a v, strip it off.
	if (version.startsWith("v")) {
	version = version.slice(1);
	}
	return pulumi.provider.main(new Provider(version), args);

Be aware: if we're switching the schema to be defined in YAML rather than JSON, it'll still need to be returned as a JSON string from the provider, so the YAML would need to be converted to JSON. See #9.