Tracking issue for GSP-706: Support HTTP Signer

[JinnyYi]

• RFC PR

Steps

• Add new interface and operations in definitions.
• Update docs in site (Add descriptions for the operaiton and a doc for migration from Reacher to HttpSigner).
• Implement integration test.

[Xuanwo]

ping @JinnyYi , we are working on #729, maybe we need to update the progress here, and close this issue if we will give up GSP-706?

[JinnyYi]

We encountered some problems in the implementation for services. Discussions:

• How to pass partIndex into QuerySignHTTP for WriteMultipart?
• #beyondstorage@gsp-706:matrix.org

We plan to split HTTPSigner into multiple interfaces and HTTPSigner will be deprecated. Here is the ongoing GSP (go-storage proposal) for tracking:

• GSP-729: Redesign HTTP Signer