- Reworked coreplugin-match.ts to more reliably extract multi-line match contexts from Obsidian's core search plugin.
- Simplified omnisearch-match.ts to better utilize the excerpts provided by the Omnisearch API, leading to more accurate context display.
- Updated ripgrep-regex.ts to align with the new search result structure.
- Improved line and context handling in search-common.ts. This includes:
  - A better truncateLine function that preserves the context around the match.
  - Performance improvements by using binary search (findLineIndexBS) for line lookups.
 - Updated SearchResult interface to better support multi-line matches.

…tions

This commit introduces support for various web search backends, providing users with more options within the plugin.

Key Changes:
- Added multiple new search backends
- Modified the settings tab to include dropdown menus for selecting the preferred web search backends, along with corresponding API key input fields where necessary.

Current Supported Search Backends:
- SerpAPI
- Scrapingdog
- Serper
- Jina
- DuckDuckGo,
- Brave

This commit introduces a major refactoring of the settings schema.

Key changes:
- Renamed `filesSearchSettings` to `fileSearchSettings`
- `migrateSettings` function is now moved to `migration.ts`. It can correctly handle schema migrations from older versions to the current one.
- Older, unused setting fields are now explicitly marked as deprecated within the settings schema to maintain backward compatibility while facilitating cleaner code.
- `DEFAULT_SETTINGS` has been updated to reflect the new structure, with some common schemas moved or reorganized.
- Tests for settings parsing have been updated to validate the new schema and migration logic.

Key Changes:
- Moved `SETTINGS_SCHEMA_VERSION` and `DeprecatedSettingsSchema` to `shared.ts`. This resolves a circular dependency, ensuring `SETTINGS_SCHEMA_VERSION` is correctly defined when migration objects are initialized.
- Simplified conditional checks within individual migration functions.
- Modified `parseInfioSettings` to first attempt strict parsing of current settings, deferring to the migration process only when an older or non-standard format is detected.

…ck-duck-scrape`

This commit temporarily hide the DuckDuckGo search option from the settings. This is due to unresolved issues with `duck-duck-scrape`.