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9a155ba747
Since current getting schema for CapnProto doesn't use cache, the
integration test was for the future if someone add cache.
Also, I was curious how schema cache affects performance and I compared reading binary files
with Protobuf (I guess it works the same for CapnProto).
```
for i in {1..1000}; do clickhouse-client -q \
"select * from test.simple format Protobuf settings format_schema='/format_schemas/simple:KeyValuePair'" > simple-protobuf${i}.bin; done
clickhouse-client --time -q "select * from file('simple-protobuf{1..999}.bin', 'Protobuf') format Null settings format_schema = 'simple:KeyValuePair'"
```
Protobuf with cache and without works with approximately the same
time.
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| clickhouse_path/format_schemas | ||
| __init__.py | ||
| test.py | ||