feat: support custom listener

[Macrow]

Add SetListener method for supporting custom listeners.

// 设置单个listener
ln, err := net.Listen("tcp", ":8199")
if err != nil {
  log.Fatal(err)
}
....
s := g.Server()
s.SetListener(ln)
...
s.Run()

// 设置多个listener
ln1, err := net.Listen("tcp", ":8199")
if err != nil {
  log.Fatal(err)
}
ln2, err := net.Listen("tcp", ":8299")
if err != nil {
  log.Fatal(err)
}
....
s := g.Server()
s.SetListener(ln1, ln2)
...
s.Run()

另外有相关的issue
#1043

[codecov-commenter]

Codecov Report

Merging #1683 (0e0d2e1) into master (d7764e2) will decrease coverage by 0.16%.
The diff coverage is 88.46%.

@@            Coverage Diff             @@
##           master    #1683      +/-   ##
==========================================
- Coverage   71.44%   71.27%   -0.17%     
==========================================
  Files         445      452       +7     
  Lines       42754    43336     +582     
==========================================
+ Hits        30544    30888     +344     
- Misses      10295    10471     +176     
- Partials     1915     1977      +62     

Flag	Coverage Δ
go-1.15	71.25% <88.46%> (-0.18%)	⬇️
go-1.16	71.24% <88.46%> (-0.16%)	⬇️
go-1.17	71.25% <88.46%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
net/ghttp/ghttp_server_config.go	61.65% <80.00%> (+1.54%)	⬆️
net/ghttp/ghttp_server_graceful.go	60.73% <100.00%> (+2.84%)	⬆️
protocol/goai/goai_response.go	46.15% <0.00%> (-34.18%)	⬇️
protocol/goai/goai_parameter.go	46.15% <0.00%> (-33.10%)	⬇️
database/gdb/gdb_core_link.go	75.00% <0.00%> (-25.00%)	⬇️
util/gvalid/gvalid.go	78.57% <0.00%> (-21.43%)	⬇️
database/gdb/gdb_model_cache.go	66.66% <0.00%> (-8.34%)	⬇️
net/gtcp/gtcp_pool.go	34.09% <0.00%> (-4.55%)	⬇️
database/gdb/gdb_model_hook.go	88.09% <0.00%> (-4.41%)	⬇️
database/gdb/gdb_core_utility.go	60.16% <0.00%> (-2.84%)	⬇️
... and 57 more

---

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[gqcn]

@Macrow 感谢参与贡献！实现的想法不错，除了代码中CR注释，这里再提点要求：任何功能的新增都应当有单元测试，以保障逻辑正确及代码质量。这一点非常重要。

[Macrow]

@gqcn 已经按照你的修改意见进行了调整，添加了单元测试。

另外对初始化listeners时做了一点点调整。使用端口作为listeners的key，以用来匹配替换rawListener。

[gqcn]

@Macrow 同时，CI失败了，往往仅当CI成功后才会进入CR流程。

[Macrow]

新增了SetListener方法，该方法会覆盖之前设置的地址端口。

另外，我在本地通过了所有测试，但github上的ci测试没有通过，点击进入错误详情看不到具体哪里出错，能否看看具体哪里测试没过？

[Macrow]

@gqcn 强哥有空帮忙看看ci错误在哪儿？

[gqcn]

@Macrow