feat: add metric feature support in goframe

[gqcn]

1. add new package gmetric, which provides asbstract metric interface definitions
2. add new cotribution package contrib/metric/otelmetric , which implements the interfaces of package gmetric

[houseme]

metric 和 trace 可以整合到一起初始化吗？

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Can metric and trace be integrated and initialized together?

[gqcn]

metric 和 trace 可以整合到一起初始化吗？

我看otel官方的示例也是分开初始化的，我们也不用整合吧

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Can metric and trace be integrated and initialized together?

I see that the official examples from Hotel are also initialized separately, so we don’t need to integrate them.