feat(wpcarro/slx.js): Support JavaScript simple-select impl

See README.md

Change-Id: I6a50e34398c42aabe3cceba160be006f1867eca4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7874
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/slx.js/README.md

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+# slx.js
+
+Filter tabular data in the browser using an ergonomic query language.
+
+## Status
+
+This project is usable today (I use it in my projects), but it's currently alpha
+status. See the wish list for remaining features.
+
+## Installation
+
+`slx.js` is available via CDN:
+
+```shell
+<script src="https://cdn.jsdelivr.net/gh/wpcarro/slx.js/index.js" async></script>
+```
+
+## Usage
+
+`slx.js` hasn't been properly benchmarked, but in my personal projects, it works
+fine with `O(1,000)s` of records.
+
+```javascript
+const cast = [
+  { first: "Graham", last: "Chapman" },
+  { first: "John", last: "Cleese" },
+  { first: "Terry", last: "Gilliam" },
+  { first: "Eric", last: "Idle" },
+  { first: "Terry", last: "Jones" },
+  { first: "Michael", last: "Palin" },
+];
+
+const config = {
+    // Match values case sensitively when filtering.
+    caseSensitive: false,
+    // Coerce values into regular expressions (instead of strings) when they're defined as atoms.
+    preferRegex: true,
+    // The key in the JS object that hosts the Date type against which we filter.
+    dateKey: 'Date',
+};
+
+console.log(select('last:^C.+$', cast, config));
+// [{ first: "Graham", last: "Chapman" }, { first: "John", last: "Cleese" }]
+```
+
+## Wish List
+
+- Support explicit grouping with parentheses (e.g. `title:once (director:Tarantino OR director:Coen)`).
+- Proper benchmarking (see "Usage" section).
+- Something something documentation.
+- Something something testing.
+
+## See also:
+
+- [`slx`](https://github.com/wpcarro/slx)