feat: add configurable limit to search results (adityatelange#1281)

* feat: add configurable limit to search results

Signed-off-by: Navendu Pottekkat <navendu@apache.org>

* Handle case where params.fuseOpts is not defined
resulting into `Cannot read properties of null (reading 'limit')`


Utilizes search options by fuse https://www.fusejs.io/api/methods.html#search 

The options:

limit (type: number): Denotes the max number of returned search results.

---------

Signed-off-by: Navendu Pottekkat <navendu@apache.org>
Co-authored-by: Aditya Telange <21258296+adityatelange@users.noreply.github.com>

assets/js/fastsearch.js

@@ -77,7 +77,12 @@ sInput.onkeyup = function (e) {
     // run a search query (for "term") every time a letter is typed
     // in the search box
     if (fuse) {
-        const results = fuse.search(this.value.trim()); // the actual query being run using fuse.js
+        let results;
+        if (params.fuseOpts) {
+            results = fuse.search(this.value.trim(), {limit: params.fuseOpts.limit}); // the actual query being run using fuse.js along with options
+        } else {
+            results = fuse.search(this.value.trim()); // the actual query being run using fuse.js
+        }
         if (results.length !== 0) {
             // build our html if result exists
             let resultSet = ''; // our results bucket