Expose CommitBatchingWindowSize metric to fdbcli status

Changes:

mr-status-json-schemas.rst.inc: Update schema to reflect the change made
to Schemas.cpp (to include statistics about CommitBatchingWindowSize).

release-notes-700.rst: Add a note about the new metric in the Status section.

documentation/sphinx/source/mr-status-json-schemas.rst.inc

@@ -171,6 +171,18 @@
                      "p99":0.0,
                      "p99.9":0.0
                   },
+                  "commit_batching_window_size":{
+                     "count":0,
+                     "min":0.0,
+                     "max":0.0,
+                     "median":0.0,
+                     "mean":0.0,
+                     "p25":0.0,
+                     "p90":0.0,
+                     "p95":0.0,
+                     "p99":0.0,
+                     "p99.9":0.0
+                  },
                   "grv_latency_bands":{ // How many GRV requests belong to the latency (in seconds) band (e.g., How many requests belong to [0.01,0.1] latency band). The key is the upper bound of the band and the lower bound is the next smallest band (or 0, if none). Example: {0.01: 27, 0.1: 18, 1: 1, inf: 98,filtered: 10}, we have 18 requests in [0.01, 0.1) band.
                      "$map_key=upperBoundOfBand": 1
                   },

documentation/sphinx/source/release-notes/release-notes-700.rst

@@ -30,7 +30,7 @@ Fixes
 
 Status
 ------
-
+* Added ``commit_batching_window_size`` to the proxy roles section of status to record statistics about commit batching window size on each proxy. `(PR #4735) <https://github.com/apple/foundationdb/pull/4735>`_
 
 
 Bindings