feat(lib): relocate GithubReleases type and implement custom payload

* Also breaks down `GithubReleases` into array of `GithubRelease` type
* Adds a `Custom` operation type for internal `Github` class, allowing
  user to mention custom request data

toolchainlib/src/github.luau

@@ -18,7 +18,28 @@ export type Config = {
 	authToken: Option<string>,
 	retries: Option<number>,
 }
-export type GithubOperation = "FetchReleases" | "GetMetadata" | "GetActionArtifacts"
+export type GithubOperation =
+	"FetchReleases"
+	| "GetMetadata"
+	| "GetActionArtifacts"
+	| { type: "Custom", payload: net.FetchParams }
+
+export type GithubRelease = {
+	tag_name: string,
+	created_at: string,
+	published_at: string,
+	prerelease: boolean,
+	draft: boolean,
+	assets: {
+		{
+			name: string,
+			browser_download_url: string,
+			size: number,
+			content_type: string,
+		}
+	},
+}
+export type GithubReleases = { GithubRelease }
 
 local API_BASE_URL = "https://api.github.com"
 local DEFAULT_MAX_RETRIES = 5
@@ -60,6 +81,10 @@ function Github.queueTransactions(self: Github, operations: { GithubOperation })
 			req.method = "GET"
 		end
 
+		if typeof(operation) == "table" and operation.type == "Custom" then
+			req = operation.payload
+		end
+
 		--  TODO: Other methods
 
 		table.insert(queue, function(retries: number)

toolchainlib/src/init.luau

@@ -31,21 +31,8 @@ export type ToolId = {
 	version: Option<Semver.SemverImpl>,
 }
 
-export type GithubReleases = {
-	{
-		tag_name: string,
-		prerelease: boolean,
-		draft: boolean,
-		assets: {
-			{
-				name: string,
-				browser_download_url: string,
-				size: number,
-				content_type: string,
-			}
-		},
-	}
-}
+-- TODO: Remove this in a breaking change
+export type GithubReleases = Github.GithubReleases
 
 local WARN_PREFIX = `{stdio.color("yellow")}{stdio.style("bold")}warn{stdio.color("reset")}:`