Create Obsidian plugin for Khoj

- Features
  - Search using Khoj from within the Obsidian app
    Allow Natural language search on your (markdown) notes in Obsidian Vault

  - Show search results as rendered (instead of raw) Markdown
    Improve legibility of the results

  - Jump to selected note from search result in Khoj search modal
    Simplify seeing result within its original note context

  - Automatically configure khoj to index markdown files in current vault
    Reduce khoj setup steps for plugin users by using reasonable defaults

    - Code updates the markdown config in khoj.yml and triggers index update
    - It can be configured by user in khoj plugin settings, if required

  - Add Demo and detailed Readme for the Obsidian plugin
    Ease setup and usage. Give context about capabilities

- Miscellaneous
  - Trying keep a mono repo until the Khoj project is mature enough
    to reduce maintainance burden

src/interface/obsidian/esbuild.config.mjs

@@ -0,0 +1,42 @@
+import esbuild from "esbuild";
+import process from "process";
+import builtins from 'builtin-modules'
+
+const banner =
+`/*
+THIS IS A GENERATED/BUNDLED FILE BY ESBUILD
+if you want to view the source, please visit the github repository of this plugin
+*/
+`;
+
+const prod = (process.argv[2] === 'production');
+
+esbuild.build({
+    banner: {
+        js: banner,
+    },
+    entryPoints: ['src/main.ts'],
+    bundle: true,
+    external: [
+        'obsidian',
+        'electron',
+        '@codemirror/autocomplete',
+        '@codemirror/collab',
+        '@codemirror/commands',
+        '@codemirror/language',
+        '@codemirror/lint',
+        '@codemirror/search',
+        '@codemirror/state',
+        '@codemirror/view',
+        '@lezer/common',
+        '@lezer/highlight',
+        '@lezer/lr',
+        ...builtins],
+    format: 'cjs',
+    watch: !prod,
+    target: 'es2018',
+    logLevel: "info",
+    sourcemap: prod ? false : 'inline',
+    treeShaking: true,
+    outfile: 'main.js',
+}).catch(() => process.exit(1));