[WebDAV] Implement command pattern, streamline lifecycle, remove WebdavScope

[rfc2822]

• Remove WebdavScope: there is no content provider lifecycle except onCreate() for initialization. A content provider lives until the whole process is terminated. So there's no chance to remove the WebdavScope from memory, which makes the whole scope useless. (Which is probably the reason why there is no such scope in Hilt by default).
• Moved each WebDAV operation to a separate class (command pattern) with its own well-defined dependencies.
• Moved common methods to DocumentProviderUtils.

[Copilot]

Pull Request Overview

This PR refactors the WebDAV documents provider by removing the WebdavScope annotation and reorganizing the code into separate operation classes. The main purpose is to simplify the dependency injection structure and improve code organization by breaking down the large DavDocumentsProvider class into focused, testable operation components.

Key changes:

• Removed WebdavScope custom DI scope and related components
• Extracted WebDAV operations into dedicated classes with clear responsibilities
• Simplified the main DavDocumentsProvider to use individual operation classes via EntryPoint pattern
• Consolidated utility functions into DocumentProviderUtils

Reviewed Changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
WebdavScope.kt	Deleted custom Dagger scope and component definitions
DavDocumentsProvider.kt	Refactored to delegate operations to separate classes via EntryPoint
operation/*.kt	New operation classes for each WebDAV document provider functionality
DocumentProviderUtils.kt	New utility class consolidating helper functions and extension methods
DavHttpClientBuilder.kt	New dedicated class for building HTTP clients
ThumbnailCache.kt	Removed @WebdavScoped annotation
RandomAccessCallbackWrapper.kt	Simplified API level requirement annotation
WebDavMountRepository.kt	Updated method calls to use new utility class
QueryChildDocumentsOperationTest.kt	Updated test to use new operation class directly
Bridged.kt	New qualifier annotation

Files not reviewed (1)

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