feat: standards, shared CI and release tooling for NAPALM drivers

STANDARDS.md binds every repository in the NAPALM org: one default branch,
Conventional Commits, the device-types contract, test-driven development,
clean-code limits, a quality ratchet for existing code, packaging rules and
releases by tag to PyPI.

napalm-standard holds what a tool can check: the conformance check (with
release rules on a tag), the quality ratchet (ported from netOrk's
quality_ratchet.py), and the Gitea release from the CHANGELOG section.
.gitea/workflows/driver.yml is the CI every driver calls; template/ is a new
driver's starting point and passes the check as it is.

template/napalm_example/parsers/__init__.py

@@ -0,0 +1,45 @@
+"""Pure functions: device output in, typed values out. No I/O here."""
+
+from __future__ import annotations
+
+import re
+from typing import TypedDict
+
+#: "Key : value" lines of `show version`.
+_FIELD = re.compile(r"^(?P<key>[^:\n]+?)\s*:\s*(?P<value>.*)$", re.MULTILINE)
+#: "3 days, 4:05:06" or "4:05:06".
+_UPTIME = re.compile(r"^(?:(?P<days>\d+) days?, )?(?P<h>\d+):(?P<m>\d\d):(?P<s>\d\d)$")
+_SECONDS_PER_DAY = 86400
+
+
+class VersionDict(TypedDict):
+    model: str
+    hostname: str
+    os_version: str
+    serial_number: str
+    uptime: float
+
+
+def parse_uptime(text: str) -> float:
+    """Seconds from an uptime like ``3 days, 4:05:06``."""
+    match = _UPTIME.match(text.strip())
+    if not match:
+        raise ValueError(f"unreadable uptime: {text!r}")
+    days = int(match.group("days") or 0)
+    hours, minutes, seconds = (int(match.group(k)) for k in ("h", "m", "s"))
+    return float(days * _SECONDS_PER_DAY + hours * 3600 + minutes * 60 + seconds)
+
+
+def parse_version(text: str) -> VersionDict:
+    """Facts from ``show version``; a field the device did not print is an error."""
+    fields = {m.group("key").strip(): m.group("value").strip() for m in _FIELD.finditer(text)}
+    try:
+        return {
+            "model": text.splitlines()[0].removesuffix(" Switch").strip(),
+            "hostname": fields["Hostname"],
+            "os_version": fields["Firmware"],
+            "serial_number": fields["Serial number"],
+            "uptime": parse_uptime(fields["Uptime"]),
+        }
+    except KeyError as exc:
+        raise ValueError(f"show version lacks {exc.args[0]}") from exc