2095 sqlite handler

[peterfraedrich]

Adds sqlite database handler as requested in #2095

I can't find a more elegant way than copying the sqlite database to a new file; no sqlite drivers support opening a database from a Read/Write interface instead of a "real" file. That said, I tried to keep the costly operations at a minimum and chunk as small as possible (row).

Does not introduce any new test or lint failures.

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Note

Medium Risk
Adds a new file-processing path that opens and queries SQLite databases (including temp-file writes) and introduces the modernc.org/sqlite dependency, which could affect performance and error handling on large/hostile DB inputs.

Overview
Adds first-class handling for SQLite database files (application/vnd.sqlite3). The new sqliteHandler copies the input to a temp file, opens it via modernc.org/sqlite, enumerates tables, and emits each row (YAML-serialized with a __table__ tag) through the existing chunking pipeline for scanning.

Updates handler selection to route SQLite MIME types to the new handler and adds a basic unit test validating the handler produces expected output counts. Dependency updates include adding modernc.org/sqlite (and its indirect deps) and bumping a few Go module versions (e.g., github.com/google/pprof, golang.org/x/exp, golang.org/x/tools).

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