feat: limit too big filters

[LionelZoubritzky-IGN]

Description

Reject any query that requires a too-big CQL filter ("too big" is at 2 MiB, checked experimentally).

Related issues (if applicable)

Close #151, close #215.

Motivation

Too big filters lead to timeout or to silently wrong answers (see #215).

Implementation

Check the size of the intersect_feature_filter and reject it if too large with a clear error message. Also guard against too large CQL filters in general (which could result from a too-large where clause as well).

The filter never silently switches to the -CARTO-PE version because the id can change: departement.72 does not mean the same thing in ADMINEXPRESS-COG.LATEST and in ADMINEXPRESS-COG-CARTO-PE.LATEST. However, the error message gives a hint to the LLM that it should use the -CARTO-PE version.

Testing

npm run build && npm run verify: 611+4+35 tests green and "how many buildings in Vendée" correctly returns around 840000.

Checklist

• The PR is focused and of a reasonable size.
• The commit history is clean.
• Relevant documentation has been updated.
• Relevant tests have been added or updated.