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GH-38700: [C++][FS][Azure] Implement `DeleteDir()` (#38793)

### Rationale for this change

`DeleteDir()` deletes the given directory recursively like other filesystem implementations.

### What changes are included in this PR?

* Container can be deleted with/without hierarchical namespace support.
* Directory can be deleted with hierarchical namespace support.
* Directory can't be deleted without hierarchical namespace support. But blobs under the given path can be deleted. So these blobs are deleted and the given virtual directory is also deleted.
    
### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* Closes: #38700

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>