feat: enhance user-side configuration style

[DMwangnima]

Please see protocol/triple/internal/client for details.

We moved all bare configurations from config package to global package almostly. Please refer to #2406 #2413. These configurations contain ReferenceConfig. As a result, user-side code would change like this if users make use of client layer directly:

cli, err := client.NewClient(
    client.WithReferenceConfig(
        global.WithReference_URL("127.0.0.1:20000"),
    ),
)

For users getting started, understanding the conception of Reference is a little bit difficult. They would be more receptive to this form:

cli, err := client.NewClient(
    client.WithURL("127.0.0.1:20000"),
)

They do not need to understand Reference and import global package. All the contents they need belong to client package.

We provide this type of API for client package because client package is a very clear module. Configurations only belong to a module could be provided with <module_name>.WithXXX. And configurations relied on by many modules could be provided with global.With<config_name>_XXX.

[sonarcloud]

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[chickenlj]

LGTM.