[Enhancement] Support Go SDK HTTP Client Load Balance

[horoc]

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• I had searched in the issues and found no similar issues.

Enhancement Request

Currently, with Go SDK, HTTP clients can only specify and connect to ONE single server address,

Considering it's a common feature of clients to connect with the EventMesh server cluster, we should support cluster address selection and load balance in Go SDK clients, like what Java SDK did.

• [Enhancement] Support Go SDK HTTP Client Load Balance: Selector Interface #1744
• [Enhancement] Support Go SDK HTTP Client Load Balance: Random Selector #1745
• [Enhancement] Support Go SDK HTTP Client Load Balance: Weight Random Selector #1746
• [Enhancement] Support Go SDK HTTP Client Load Balance: Weight Round Robin Selector #1747
• [Enhancement] Support Go SDK HTTP Client Load Balance: Unit Test and Client Update #1762

Describe the solution you'd like

support Go SDK load balance.

Are you willing to submit PR?

• Yes I am willing to submit a PR!