rpc: remove logic for generating openapi spec

Since we'll be leveraging gRPC + protobuf instead of a handrolled REST
api we no longer need to maintain the infra for generating an openapi
scpec. In the future we can explore generating an openapi spec from the
proto files themselves as is used in grpc-gateway.

crates/sui-rpc-api/Cargo.toml

@@ -15,7 +15,6 @@ reqwest.workspace = true
 url.workspace = true
 serde.workspace = true
 serde_json.workspace = true
-serde_yaml.workspace = true
 serde_with.workspace = true
 tap.workspace = true
 thiserror.workspace = true
@@ -25,9 +24,6 @@ itertools.workspace = true
 sui-sdk-types.workspace = true
 sui-sdk-transaction-builder.workspace = true
 prometheus.workspace = true
-openapiv3 = { git = "https://github.com/bmwill/openapiv3.git", rev = "ca4b4845b7c159a39f5c68ad8f7f76cb6f4d6963" }
-schemars.workspace = true
-documented = "0.6.0"
 http.workspace = true
 tower.workspace = true