GDAL Filesystem rework, updates, fixes, ST_MakeValid.

[Maxxen]

Changes

• Update to DuckDB v0.9.2
• Standardize PascalCase naming for spatial functions. Only important for future doc generation.
• Add simple version of ST_MakeValid (no extra args)
• Disable test for database csv export/import. This broke in v0.9.2 due to the csv sniffer rejecting blobs
• Update GDAL to 3.8
  • New PMTiles and JSONFG drivers
  • Remove XLSX hacks now that there are proper open options for headers/field types
• Rework GDAL<->DuckDB filesystem integration, hopefully fixing most of the issues that have occurred
  • We now provide a separate file handler for every client context, with a randomized unique prefix. If GDAL spawns its own threads it can still access the client context through the fs.
  • Should hopefully work with concurrent connections (as they get their own FS).
  • Improved error handling. Some error messages are a little wonky but we can work on that.
  • We now implement unlink, so gdal will delete tempfiles properly.
  • TODO: Look into cache/buffering for network file access. Some formats (xlsx) are a lot slower than they need to be, also upstream patch to remove file handlers to GDAL.

Fixes

Closes #184
Closes #182
Closes #181
Closes #180