Disambiguate fetch-request-streams feature

Rewrite the fetch-request-streams feature to make it more clear what
precise property it covers, and add a new fetch-body-stream feature to
cover the `body` option to the `fetch` function supporting
`ReadableStream` objects.

Author: jgraham

features/fetch-request-streams.yml

@@ -1,5 +1,6 @@
-name: Fetch upload streams
-description: A `fetch()` request uploads a stream of data to the server when a request's `body` property is a `ReadableStream` object.
+name: Request body property
+description: A `ReadableStream` can be used as the body of a `Request` object.
 spec: https://fetch.spec.whatwg.org/#concept-body-stream
 compat_features:
   - api.Request.body
+  - api.Request.Request.request_body_readablestream

features/fetch-request-streams.yml.dist

@@ -7,7 +7,20 @@ status:
     chrome: "105"
     chrome_android: "105"
     edge: "105"
-    safari: "11.1"
-    safari_ios: "11.3"
 compat_features:
+  # baseline: false
+  # support:
+  #   chrome: "105"
+  #   chrome_android: "105"
+  #   edge: "105"
+  #   safari: "11.1"
+  #   safari_ios: "11.3"
   - api.Request.body
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: false
+  # support:
+  #   chrome: "105"
+  #   chrome_android: "105"
+  #   edge: "105"
+  - api.Request.Request.request_body_readablestream

features/fetch.yml

@@ -25,7 +25,6 @@ compat_features:
   - api.Request.Request.cross_origin_stripped
   - api.Request.Request.init_keepalive_parameter
   - api.Request.Request.init_referrer_parameter
-  - api.Request.Request.request_body_readablestream
   - api.Request.Request.response_body_readablestream
   - api.Request.arrayBuffer
   - api.Request.blob

features/fetch.yml.dist

@@ -442,13 +442,6 @@ compat_features:
   #   edge: "79"
   - api.Request.isHistoryNavigation
 
-  # baseline: false
-  # support:
-  #   chrome: "105"
-  #   chrome_android: "105"
-  #   edge: "105"
-  - api.Request.Request.request_body_readablestream
-
   # baseline: false
   # support:
   #   chrome: "131"