feat(webserver): include whole file content for code reference (#3247)

* feat(webserver): add repository service to Webserver

The code changes add the repository service to the Webserver implementation. This allows the Webserver to interact with the repository for various operations.

Note: The commit message format follows the convention used in the recent repository commits.

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* feat: add resolve_repository_by_source_id method to RepositoryService

This commit adds the resolve_repository_by_source_id method to the RepositoryService trait in the tabby-schema crate. This method allows resolving a repository by its source ID, providing access to the repository for various operations.

Note: The commit message format follows the convention used in the recent repository commits.

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* refactor: merge code snippets in AnswerService

This commit refactors the `merge_code_snippets` method in the `AnswerService` to improve code readability and maintainability. The method now takes a list of `CodeSearchHit` objects and merges them based on the file path. It also handles cases where there are multiple hits for the same file, extracting relevant lines of code and calculating average scores. This change enhances the efficiency and accuracy of code snippet merging in the AnswerService.

Note: The commit message format follows the convention used in the recent repository commits.

* docs: adding comments into merge_code_snippets

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* refactor: move merge_snippet as single function

* Update ee/tabby-webserver/src/service/answer.rs

* Update ee/tabby-webserver/src/service/answer.rs

* refactor: extract read_file_content, avoid repeat call repo, group by sourceid+filepath

* fix: fixing test bug after merge main branch

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* to: adding global repos cache and adding clone methods for repository and GitReference

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* chore: adding derive clone remove unused methods

* refactor(answer): remove global repos caches, find it before merge_snippets

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* refactor: extract read_file_content, avoid repeat call repo, group by sourceid+filepath

to: adding back error log

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* refactor: improve file reading performance and error handling in read_file_content, return raw string content

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* simplify implementation

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Meng Zhang <[email protected]>