chore(project): 添加项目配置文件和忽略规则

- 添加 Babel 配置文件支持 ES6+ 语法转换
- 添加 ESLint 忽略规则和配置文件
- 添加 Git 忽略规则文件
- 添加 Travis CI 配置文件
- 添加 1.4.2 版本变更日志文件
- 添加 Helm 图表辅助模板文件
- 添加 Helm 忽略规则文件

codecov.yml

@@ -0,0 +1,25 @@
+codecov:
+  require_ci_to_pass: yes
+coverage:
+  status:
+    patch: no
+    project:
+      default:
+        threshold: 1%
+        if_not_found: success
+    changes: no
+  precision: 2
+  range: "50...100"
+ignore:
+ - "test/.*"
+ - ".github/.*"
+ - ".mvn/.*"
+ - ".style/.*"
+ - "*.md"
+ - "rm-datasource/src/test/java/io/seata/rm/datasource/mock"
+ - "sqlparser/seata-sqlparser-antlr/src/main/java/io/seata/sqlparser/antlr/mysql/antlr/.*"
+ - "sqlparser/seata-sqlparser-antlr/src/main/java/io/seata/sqlparser/antlr/mysql/parser/.*"
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: no