[UCCORE-1790] API v0.7 support

[alxnik-uc]

Description

https://tiugotech.atlassian.net/browse/UCCORE-1793

Checklist

• Tests (if applicable)
• Documentation (if applicable)
• Changelog stub (or use conventional commit messages)

[Copilot]

Pull request overview

This PR updates the crate to support Uploadcare REST API v0.7 (and associated new/changed endpoints) while also aligning Upload API request/response handling with documented behavior. It introduces new functionality (file search, tags/metadata endpoints, Add-Ons support) and hardens HTTP/error handling (better parsing of non-JSON/empty bodies, safer Retry-After parsing, warning header logging, and percent-encoding for user-supplied query values).

Changes:

• Move REST client to v0.7-only semantics (API version enum update, request/response shape updates across file/group/webhook/project/conversion).
• Add new REST capabilities: Add-Ons module, file search, file tags and metadata endpoints.
• Improve robustness: error body handling (incl. empty/non-JSON), Retry-After parsing, warning header logging, query value encoding, and Upload API schema fixes (e.g., from_url response tagging, u64 counters, nullable fields).

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/upload.rs	Updates upload integration tests for metadata/tags and v0.7-compatible Upload API params/returns.
tests/testenv/mod.rs	Minor cleanup around crate import usage.
tests/rest.rs	Switches REST tests to v0.7 and adds coverage for metadata/tags/search/addons/webhook behavior changes.
src/webhook.rs	Webhook API v0.7 adjustments: subscription versioning, safer partial updates, masked secret in Debug, new get.
src/upload.rs	Upload API improvements: metadata/tags params, omit store default, u64 counters, tagged from_url responses, schema fixes.
src/ucare/upload/mod.rs	Upload client error/response handling improvements (Retry-After parsing, empty success bodies, 5xx mapping).
src/ucare/rest/mod.rs	REST client v0.7-only, improved error parsing/truncation, warning header logging, safer Retry-After parsing.
src/ucare/rest/auth.rs	Auth header/date format adjustments and test updates.
src/ucare/mod.rs	Adds query value percent-encoding helper and shared deserializer helper; improves query building behavior.
src/ucare/error.rs	Adds new error variants (405/409/5xx) and display formatting updates.
src/types.rs	Introduces shared REST/Upload types (ContentInfo, streams, ImageInfo, etc.).
src/project.rs	Updates project service and exposes autostore_enabled.
src/lib.rs	Updates docs/examples for v0.7 and exports new modules/types.
src/group.rs	Group v0.7 updates: delete endpoint, query encoding, info payload shape updates.
src/file.rs	Major v0.7 file API update: filters/orderings, content_info/types, tags/metadata/search/appdata inclusion.
src/conversion.rs	Conversion v0.7 updates: document_info, corrected video endpoints, status/result schema fixes.
src/addons.rs	New Add-Ons client module (execute/status + polling helper with timeout).
README.md	Updates REST API version in example snippet.
CHANGELOG.md	Adds detailed “Unreleased” notes documenting v0.7 breaking changes and new features.
.github/workflows/test.yml	Adjusts CI test invocation to run all library tests without filtering by crate name.

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