chore(bigtable): Update CODEOWNERS to granularly separate subcomponen…

…ts (#4466)

.github/CODEOWNERS

@@ -1,14 +1,17 @@
 # Default owner for all directories not owned by others
-*                   @googleapis/yoshi-go-admins
+*                       @googleapis/yoshi-go-admins
 
-/bigtable/          @crwilcox @tritone @kolea2 @googleapis/yoshi-go-admins
-/bigquery/          @googleapis/api-bigquery @googleapis/yoshi-go-admins
-/datastore/         @crwilcox @tritone @googleapis/yoshi-go-admins
-/firestore/         @crwilcox @tritone @googleapis/yoshi-go-admins
-/pubsub/            @googleapis/api-pubsub @googleapis/yoshi-go-admins
-/pubsublite/        @googleapis/api-pubsub @googleapis/yoshi-go-admins
-/spanner/           @skuruppu @hengfengli @googleapis/yoshi-go-admins
-/storage/           @googleapis/storage-dpe @googleapis/yoshi-go-admins
-/errorreporting/    @googleapis/api-logging @googleapis/yoshi-go-admins
-/logging/           @googleapis/api-logging @googleapis/yoshi-go-admins
-/profiler/          @googleapis/api-profiler @googleapis/yoshi-go-admins
+/bigtable/              @crwilcox @tritone @kolea2 @googleapis/yoshi-go-admins
+/bigtable/cmd/cbt       @garye @igorbernstein2 @googleapis/yoshi-go-admins
+/bigtable/cmd/emulator  @garye @igorbernstein2 @googleapis/yoshi-go-admins
+/bigtable/bttest        @garye @igorbernstein2 @googleapis/yoshi-go-admins
+/bigquery/              @googleapis/api-bigquery @googleapis/yoshi-go-admins
+/datastore/             @crwilcox @tritone @googleapis/yoshi-go-admins
+/firestore/             @crwilcox @tritone @googleapis/yoshi-go-admins
+/pubsub/                @googleapis/api-pubsub @googleapis/yoshi-go-admins
+/pubsublite/            @googleapis/api-pubsub @googleapis/yoshi-go-admins
+/spanner/               @skuruppu @hengfengli @googleapis/yoshi-go-admins
+/storage/               @googleapis/storage-dpe @googleapis/yoshi-go-admins
+/errorreporting/        @googleapis/api-logging @googleapis/yoshi-go-admins
+/logging/               @googleapis/api-logging @googleapis/yoshi-go-admins
+/profiler/              @googleapis/api-profiler @googleapis/yoshi-go-admins