[PR] feat(!): Allow users to build operator from config [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new pull request, #4919:
URL: https://github.com/apache/opendal/pull/4919

   # Which issue does this PR close?
   
   <!--
   We generally require a GitHub issue to be filed for all bug fixes and enhancements. You can link an issue to this PR using the GitHub syntax. For example `Closes #123` indicates that this PR will close issue #123.
   -->
   
   Part of https://github.com/apache/opendal/issues/3240.
   
   # Rationale for this change
   
   This adds `Operator::from_config` support so users can build operator from config directly:
   
   ```rust
   use std::collections::HashMap;
   
   use opendal::services::MemoryConfig;
   use opendal::Operator;
   async fn test() -> Result<()> {
       let mut cfg = MemoryConfig::default();
       cfg. root = Some("/".to_string());
   
       // Build an `Operator` to start operating the storage.
       let op: Operator = Operator::from_config(cfg)?.finish();
   
       Ok(())
   }
   ```
   
   We have to introduce a new trait `Configurator` since we can't infer `B` while given `B::Config`.
   
   # What changes are included in this PR?
   
   New API `Operator::from_config`. This API also changed `Builder`:
   
   ```diff
   - fn build(&mut self) -> Result<Self::Accessor>;
   + fn build(self) -> Result<impl Access>;
   ```
   
   This change fixed long existed issues about `reusing builder` and lifetime.
   
   # Are there any user-facing changes?
   
   
   <!--
   If there are user-facing changes then we may require documentation to be updated before approving the PR.
   -->
   
   <!---
   If there are any breaking changes to public APIs, please add the `breaking-changes` label.
   -->
   
   This is breaking change PR.


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Re: [PR] feat(!): Allow users to build operator from config [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo merged PR #4919:
URL: https://github.com/apache/opendal/pull/4919


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