Crash seen on Stream reset by server, can we handle gracefully?

[lizziepaquette]

Describe the bug

We're seeing a crash when the connection is canceled.

** (CaseClauseError) no case clause matching: {:error, %GRPC.RPCError{message: ":stream_error: {:stream_error, :no_error, :\"Stream reset by server.\"}", status: 13}}
    (grpc) lib/grpc/stub.ex:456: GRPC.Stub.recv_body/5
    (grpc) lib/grpc/stub.ex:427: GRPC.Stub.do_recv/2

To Reproduce
We think the client is canceling the connection and then the server resets, but we're not sure.

Expected behavior
We're wondering if this case clause should propagate the error coming from the gun adapter rather than crashing. @tony612 any insight?

Versions:

• Elixir: 1.8.1
• mix.lock(grpc, gun, cowboy, cowlib):
• "grpc": {:git, "https://github.com/brexhq/grpc-elixir.git", "5260f9ca0a7121d7946acb13451f82f21063b3d6", [branch: "brex-head"]},
• "cowboy": {:hex, :cowboy, "2.7.0", "91ed100138a764355f43316b1d23d7ff6bdb0de4ea618cb5d8677c93a7a2f115", [:rebar3], [{:cowlib, "> 2.8.0", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "> 1.7.1", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "04fd8c6a39edc6aaa9c26123009200fc61f92a3a94f3178c527b70b767c6e605"},
• "cowlib": {:hex, :grpc_cowlib, "2.8.1", "ddaf77f3b89bd8e6c76df67b28a4b069688eef91c0c497a246cf9bfcdf87f7d3", [:rebar3], [], "hexpm", "0366f82719d24af4ce45a6591f52a7fc859785823fde4cd84e0dc45119b5ed89"},
• "gun": {:hex, :grpc_gun, "2.0.0", "f99678a2ab975e74372a756c86ec30a8384d3ac8a8b86c7ed6243ef4e61d2729", [:rebar3], [{:cowlib, "~> 2.8.0", [hex: :cowlib, repo: "hexpm", optional: false]}], "hexpm", "03dbbca1a9c604a0267a40ea1d69986225091acb822de0b2dbea21d5815e410b"},

Additional context
Add any other context about the problem here.

[polvalente]

@lizziepaquette could you validate if the main branch has indeed fixed the issue through #175? We can reopen it if the bug persists.