scripts: net: add enumerate_http_status.py

Add a script to extract HTTP status values and format them
in a way that is both human readable and machine parseable.

Each line of output is of the form:

```
HTTP_{key}_{upper_val} = {key}, /**< val */
```

Signed-off-by: Christopher Friedt <cfriedt@meta.com>

scripts/net/enumerate_http_status.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+# Copyright(c) 2022 Meta
+# SPDX-License-Identifier: Apache-2.0
+
+"""Format HTTP Status codes for use in a C header
+
+This script extracts HTTP status codes from mozilla.org
+and formats them to fit inside of a C enum along with
+comments.
+
+The output may appear somewhat redundant but it strives
+to
+a) be human readable
+b) eliminate the need to look up status manually,
+c) be machine parseable for table generation
+
+The output is sorted for convenience.
+
+Usage:
+    ./scripts/net/enumerate_http_status.py
+	HTTP_100_CONTINUE = 100, /**< Continue */
+    ...
+    HTTP_418_IM_A_TEAPOT = 418, /**< I'm a teapot */
+	...
+	HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511, /**< Network Authentication Required */
+"""
+
+from lxml import html
+import requests
+import re
+
+page = requests.get('https://developer.mozilla.org/en-US/docs/Web/HTTP/Status')
+tree = html.fromstring(page.content)
+
+codes = tree.xpath('//code/text()')
+
+codes2 = {}
+for c in codes:
+    if re.match('[0-9][0-9][0-9] [a-zA-Z].*', c):
+        key = int(c[0:3])
+        val = c[4:]
+        codes2[key] = val
+
+keys = sorted(codes2.keys())
+for key in keys:
+    val = codes2[key]
+    enum_head = 'HTTP'
+    enum_body = f'{key}'
+    enum_tail = val.upper().replace(' ', '_').replace("'", '').replace('-', '_')
+    enum_label = '_'.join([enum_head, enum_body, enum_tail])
+    comment = f'/**< {val} */'
+
+    print(f'{enum_label} = {key}, {comment}')