Standard methods: Delete

Rules for AIP-135, covering delete methods.

Rule name	Description
`force-field`	Delete RPCs for resources with child collections should have a `force` field in the request.
`http-body`	Delete methods must not have an HTTP body.
`http-method`	Delete methods must use the DELETE HTTP verb.
`http-uri-name`	Delete methods must map the name field to the URI.
`method-signature`	Delete RPCs should annotate a method signature of "name".
`request-force-field`	Delete request `force` fields must have type `bool`.
`request-message-name`	Delete methods must have standardized request message names.
`request-name-behavior`	Delete RPCs should annotate the `name` field with `google.api.field_behavior`.
`request-name-field`	Delete RPCs must have a `name` field in the request.
`request-name-reference`	Delete RPCs should annotate the `name` field with `google.api.resource_reference`.
`request-name-required`	Delete RPCs must have a `name` field in the request.
`request-required-fields`	Delete RPCs must not have unexpected required fields in the request.
`request-unknown-fields`	Delete RPCs should not have unexpected fields in the request.
`response-lro`	Declarative-friendly delete methods should use long-running operations.
`response-message-name`	Delete methods must return Empty or the resource.

Note: Because AIPs sometimes cover topics that have some overlap, some rules related to delete methods may be included in the rules for other AIPs.