Fixes all our Go file imports to match the preferred spec that we've _mostly_ been using. For example:
```
import (
"context"
"time"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/xerrors"
"gopkg.in/natefinch/lumberjack.v2"
"cdr.dev/slog/v3"
"github.com/coder/coder/v2/codersdk/agentsdk"
"github.com/coder/serpent"
)
```
3 groups: standard library, 3rd partly libs, Coder libs.
This PR makes the change across the codebase. The PR in the stack above modifies our formatting to maintain this state of affairs, and is a separate PR so it's possible to review that one in detail.
## Description
Adds support for sending an ad‑hoc custom notification to the
authenticated user via API and CLI. This is useful for surfacing the
result of scripts or long‑running tasks. Notifications are delivered
through the configured method and the dashboard Inbox, respecting
existing preferences and delivery settings.
## Changes
* New notification template: “Custom Notification” with a label for a
custom title and a custom message.
* New API endpoint: `POST /api/v2/notifications/custom` to send a custom
notification to the requesting user.
* New API endpoint: `GET /notifications/templates/custom` to get custom
notification template.
* New CLI subcommand: `coder notifications custom <title> <message>` to
send a custom notification to the requesting user.
* Documentation updates: Add a “Custom notifications” section under
Administration > Monitoring > Notifications, including instructions on
sending custom notifications and examples of when to use them.
Closes: https://github.com/coder/coder/issues/19611
This PR is [resolving the dispatch part of Coder
Inbocx](https://github.com/coder/internal/issues/403).
Since the DB layer has been merged - we now want to insert notifications
into Coder Inbox in parallel of the other delivery target.
To do so, we push two messages instead of one using the `Enqueue`
method.
The experimental functions in `golang.org/x/exp/slices` are now
available in the standard library since Go 1.21.
Reference: https://go.dev/doc/go1.21#slices
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Steven Masley