feat: add scoped token support to CLI (#19985)

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Add support for scoped API tokens in CLI

This PR adds CLI support for creating and viewing API tokens with scopes and allow lists. It includes:

- New `--scope` and `--allow` flags for the `tokens create` command
- A new `tokens view` command to display detailed information about a token
- Updated table columns in `tokens list` to show scopes and allow list entries
- Updated help text and examples

These changes enable users to create tokens with limited permissions through the CLI, similar to the existing functionality in the web UI.

cli/allowlistflag.go

@@ -0,0 +1,78 @@
+package cli
+
+import (
+	"encoding/csv"
+	"strings"
+
+	"github.com/spf13/pflag"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/v2/codersdk"
+)
+
+var (
+	_ pflag.SliceValue = &AllowListFlag{}
+	_ pflag.Value      = &AllowListFlag{}
+)
+
+// AllowListFlag implements pflag.SliceValue for codersdk.APIAllowListTarget entries.
+type AllowListFlag []codersdk.APIAllowListTarget
+
+func AllowListFlagOf(al *[]codersdk.APIAllowListTarget) *AllowListFlag {
+	return (*AllowListFlag)(al)
+}
+
+func (a AllowListFlag) String() string {
+	return strings.Join(a.GetSlice(), ",")
+}
+
+func (a AllowListFlag) Value() []codersdk.APIAllowListTarget {
+	return []codersdk.APIAllowListTarget(a)
+}
+
+func (AllowListFlag) Type() string { return "allow-list" }
+
+func (a *AllowListFlag) Set(set string) error {
+	values, err := csv.NewReader(strings.NewReader(set)).Read()
+	if err != nil {
+		return xerrors.Errorf("parse allow list entries as csv: %w", err)
+	}
+	for _, v := range values {
+		if err := a.Append(v); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (a *AllowListFlag) Append(value string) error {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return xerrors.New("allow list entry cannot be empty")
+	}
+	var target codersdk.APIAllowListTarget
+	if err := target.UnmarshalText([]byte(value)); err != nil {
+		return err
+	}
+
+	*a = append(*a, target)
+	return nil
+}
+
+func (a *AllowListFlag) Replace(items []string) error {
+	*a = []codersdk.APIAllowListTarget{}
+	for _, item := range items {
+		if err := a.Append(item); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (a *AllowListFlag) GetSlice() []string {
+	out := make([]string, len(*a))
+	for i, entry := range *a {
+		out[i] = entry.String()
+	}
+	return out
+}