Move all rebar.config files into the root directory

Some tools such as nvim + erlang_ls sometimes change the cwd if
they encounter a rebar.config. Here we move all rebar.config files
into the root of the project to avoid this and also have a single
point for formatting configuration.

.gitignore

@@ -2,6 +2,7 @@
 .sw?
 .*.sw?
 /.erlang.mk/
+/_build/
 /ebin/
 /bin/
 /deps/*

deps/rabbitmq_stream/rebar.config

@@ -1,12 +0,0 @@
-{plugins, [rebar3_format]}.
-
-{format, [
-    {files, ["src/*.erl", "test/*.erl"]},
-    {formatter, default_formatter},
-    {options, #{
-                paper => 80,
-                ribbon => 70,
-                inline_attributes => {when_under, 1},
-                inline_items => {when_under, 4}
-               }}
-]}.

deps/rabbitmq_stream_common/rebar.config

@@ -1,12 +0,0 @@
-{plugins, [rebar3_format]}.
-
-{format, [
-    {files, ["src/*.erl", "test/*.erl"]},
-    {formatter, default_formatter},
-    {options, #{
-                paper => 80,
-                ribbon => 70,
-                inline_attributes => {when_under, 1},
-                inline_items => {when_under, 4}
-               }}
-]}.

deps/rabbitmq_stream_management/rebar.config

@@ -1,12 +0,0 @@
-{plugins, [rebar3_format]}.
-
-{format, [
-    {files, ["src/*.erl", "test/*.erl"]},
-    {formatter, default_formatter},
-    {options, #{
-                paper => 80,
-                ribbon => 70,
-                inline_attributes => {when_under, 1},
-                inline_items => {when_under, 4}
-               }}
-]}.

rebar.config

@@ -1,8 +1,11 @@
 {plugins, [rebar3_format]}.
 
 {format, [
-    {files, ["src/rabbit_stream_sac_coordinator.*",
-             "test/rabbit_stream_sac_coordinator_SUITE.erl"]},
+    {files, ["deps/rabbit/src/rabbit_stream_sac_coordinator.*",
+             "deps/rabbit/test/rabbit_stream_sac_coordinator_SUITE.erl",
+             "deps/rabbitmq_stream*/src/*.erl",
+             "deps/rabbitmq_stream*/test/*.erl"
+              ]},
     {formatter, default_formatter},
     {options, #{
                 paper => 80,