TileJSON support for Cloudflare and AWS [#169]

* Remove TILE_PATH configuration as this makes supporting non-tile paths difficult
* create shared/ dir in serverless for common code
* linting fixes

serverless/shared/index.test.ts

@@ -0,0 +1,27 @@
+import { test } from "node:test";
+import assert from "node:assert";
+
+import { pmtiles_path, tile_path } from "./index";
+
+test("pmtiles path", () => {
+  let result = pmtiles_path("foo", undefined);
+  assert.strictEqual(result, "foo.pmtiles");
+});
+
+test("pmtiles path", () => {
+  let result = pmtiles_path("foo", "folder/{name}/file.pmtiles");
+  assert.strictEqual(result, "folder/foo/file.pmtiles");
+});
+
+test("pmtiles path with slash", () => {
+  let result = pmtiles_path("foo/bar", "folder/{name}/file.pmtiles");
+  assert.strictEqual(result, "folder/foo/bar/file.pmtiles");
+});
+
+test("pmtiles path with multiple names", () => {
+  let result = pmtiles_path("slug", "folder/{name}/{name}.pmtiles");
+  assert.strictEqual(result, "folder/slug/slug.pmtiles");
+  result = pmtiles_path("foo/bar", "folder/{name}/{name}.pmtiles");
+  assert.strictEqual(result, "folder/foo/bar/foo/bar.pmtiles");
+});
+