feat(core): Default encoding/decoding limits (#1335)

* feat(core): Default encoding/decoding limits

This PR adds new defaults for both client and server max
encoding/decoding message size limits. By default, the max message
decoding size is `4MB` and the max message encoding size is
`usize::MAX`.

This is follow up work from https://github.com/hyperium/tonic/pull/1274

BREAKING: Default max message encoding/decoding limits

* update generated code

tests/integration_tests/Cargo.toml

@@ -14,6 +14,7 @@ futures-util = "0.3"
 prost = "0.11"
 tokio = {version = "1.0", features = ["macros", "rt-multi-thread", "net"]}
 tonic = {path = "../../tonic"}
+tracing-subscriber = {version = "0.3", features = ["env-filter"]}
 
 [dev-dependencies]
 async-stream = "0.3"
@@ -25,7 +26,7 @@ tokio-stream = {version = "0.1.5", features = ["net"]}
 tower = {version = "0.4", features = []}
 tower-http = { version = "0.4", features = ["set-header", "trace"] }
 tower-service = "0.3"
-tracing-subscriber = {version = "0.3", features = ["env-filter"]}
+tracing = "0.1"
 
 [build-dependencies]
 tonic-build = {path = "../../tonic-build"}