feat: oidc-client.js based Svelte OidcComponent

follows a pattern similar to @dopry/svelte-auth0,
but uses the more standards compliant oidc-client.js
library.

rollup.config.js

@@ -0,0 +1,32 @@
+import { terser } from 'rollup-plugin-terser';
+import commonjs from 'rollup-plugin-commonjs';
+import pkg from './package.json';
+import resolve from 'rollup-plugin-node-resolve';
+import svelte from 'rollup-plugin-svelte';
+
+const name = pkg.name
+	.replace(/^(@\S+\/)?(svelte-)?(\S+)/, '$3')
+	.replace(/^\w/, (m) => m.toUpperCase())
+	.replace(/-\w/g, (m) => m[1].toUpperCase());
+
+export default {
+	input: 'src/components/components.module.js',
+	output: [
+		{ file: pkg.module,	format: 'es', sourcemap: true, name },
+		{ file: pkg.main, format: 'umd', sourcemap: true, name }
+	],
+	plugins: [
+		svelte(),
+		resolve({
+			browser: true,
+			dedupe: (importee) =>
+				importee === 'svelte' || importee.startsWith('svelte/'),
+		}),
+		commonjs({
+			include: ['node_modules/**'],
+		}),
+		terser(),
+	]
+};
+
+