Add version prefix programmatically to the Fetcher class

Instead of hardcoding the version prefix of all endpoints to `v1` this
commit allows us to programmatically define a version prefix per
endpoint.

The version prefix represents the lowest common denominator for each
endpoint of the majority of the available seed nodes.

We still default to `v1` with this commit so this just paves the way if
we eventually want to call a `v2` endpoint of a endpoint.

http-client/lib/fetcher.ts

@@ -92,6 +92,8 @@ export interface RequestOptions {
 
 export interface FetchParams {
   method: Method;
+  // Supported httpd version prefix for this request.
+  version?: string;
   // Path to append to the `Fetcher`s base URL to get the final URL.
   path?: string;
   // Object that is serialized into JSON and sent as the data.
@@ -156,6 +158,7 @@ export class Fetcher {
     method,
     path,
     body,
+    version = "v1",
     options = {},
     query,
     headers = {},
@@ -166,7 +169,7 @@ export class Fetcher {
 
     const pathSegment = path === undefined ? "" : `/${path}`;
 
-    let url = `${this.#baseUrl.scheme}://${this.#baseUrl.hostname}:${this.#baseUrl.port}/api/v1${pathSegment}`;
+    let url = `${this.#baseUrl.scheme}://${this.#baseUrl.hostname}:${this.#baseUrl.port}/api/${version}${pathSegment}`;
 
     if (query) {
       const searchparams = new URLSearchParams(query as Record<string, string>);