Add a few type definitions that I had to write today for the sake of demoing things. (#302)

We're working towards #60 by adding type definitions for `@lute/crypto`,
@lute/vm`, and `@lute/net`, plus two missing functions from the
`@lute/luau` definitions. These came out of making a short demo video of
Lute for internal use.

Author: aatxe

definitions/crypto.luau

@@ -0,0 +1,17 @@
+local crypto = {}
+
+export type Hash<T> = { __hash: T }
+
+crypto.hash = {
+	md5 = {} :: Hash<"md5">,
+	sha1 = {} :: Hash<"sha1">,
+	sha256 = {} :: Hash<"sha256">,
+	sha512 = {} :: Hash<"sha512">,
+	blake2b256 = {} :: Hash<"blake2b256">,
+}
+
+function crypto.digest(hash: Hash<any>, message: string | buffer): buffer
+	error("not implemented")
+end
+
+return crypto

definitions/luau.luau

@@ -563,4 +563,14 @@ function luau.parseexpr(source: string): AstExpr
 	error("not implemented")
 end
 
+export type Bytecode = { bytecode: string }
+
+function luau.compile(source: string): Bytecode
+	error("not implemented")
+end
+
+function luau.load(bytecode: Bytecode): () -> ...any
+	error("not implemented")
+end
+
 return luau

definitions/net.luau

@@ -0,0 +1,34 @@
+local net = {}
+
+export type metadata = {
+	method: string?,
+	body: string?,
+	headers: { [string]: string }?,
+}
+
+export type request = {
+	body: string,
+	headers: { [string]: string },
+	status: number,
+	ok: boolean,
+}
+
+function net.request(url: string, metadata: metadata?): request
+	error("not implemented")
+end
+
+export type handler = (...any) -> ...any
+
+export type configuration = {
+	hostname: string?,
+	port: number?,
+	reuseport: boolean?,
+	tls: { cert_file_name: string, key_file_name: string, passphrase: string?, ca_file_name: string? },
+	handler: handler,
+}
+
+function net.serve(config: configuration | handler)
+	error("not implemented")
+end
+
+return net

definitions/vm.luau

@@ -0,0 +1,7 @@
+local vm = {}
+
+function vm.create(path: string): any
+	error("not implemented")
+end
+
+return vm