[Base] Add typed Field Groups shortcut

[nguyenngothuong]

Summary

Add a typed Base shortcut for creating Field Groups (column groups in the Base UI). This is distinct from record grouping through +view-set-group.

Environment

• lark-cli: 1.0.81
• Brand: Lark
• Identity tested: user

Current behavior

lark-cli base --help exposes field CRUD and view grouping, but no +field-group-* shortcut. Agents must use the raw API escape hatch:

lark-cli api POST /open-apis/bitable/v1/apps/<app_token>/tables/<table_id>/field_groups \
  --as user \
  --data @field-groups.json

The endpoint works when the token has base:field_group:create. It is also represented by AppTableFieldGroup.Create in the official Go SDK.

Proposed behavior

Provide a typed shortcut such as:

lark-cli base +field-group-create \
  --base-token <app_token> \
  --table-id <table_id> \
  --json @field-groups.json \
  --as user \
  --dry-run

The shortcut should:

• Declare and check base:field_group:create.
• Validate the top-level field_groups array and non-empty children.
• Explain that each field can belong to only one Field Group.
• Surface error 1254122 as an existing/duplicate group membership conflict.
• Clearly distinguish Field Groups from +view-set-group.
• Return the created field_groups[].id, name, and description.

If the platform only exposes create today, the CLI should not invent unsupported list/update/delete operations.

References

• Official SDK sample: https://github.com/larksuite/oapi-sdk-go/blob/v3_main/sample/apiall/bitablev1/create_appTableFieldGroup.go
• Endpoint: POST /open-apis/bitable/v1/apps/:app_token/tables/:table_id/field_groups