reactor rpc (#179)

* reactor rpc generation

* update flag

* update command

* update command

* update unit test

* delete test file

* optimize code

* update doc

* update gen pb

* rename target dir

* update mysql data type convert rule

* add done flag

* optimize req/reply parameter

* optimize req/reply parameter

* remove waste code

* remove duplicate parameter

* format code

* format code

* optimize naming

* reactor rpcv2 to rpc

* remove new line

* format code

* rename underline to snake

* reactor getParentPackage

* remove debug log

* reactor background

tools/goctl/rpc/generator/filename.go

@@ -0,0 +1,11 @@
+package generator
+
+import (
+	"strings"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util/stringx"
+)
+
+func formatFilename(filename string) string {
+	return strings.ToLower(stringx.From(filename).ToCamel())
+}