Retrieve the list of demos. Retrieve the list of demos. Responses200List of demosSchema — OPTIONAL object[]description stringDescription of the demo (parsed from SQL preamble).name stringName of the demo (parsed from SQL preamble).program_code stringProgram SQL code.title stringTitle of the demo (parsed from SQL preamble).udf_rust stringUser defined function (UDF) Rust code.udf_toml stringUser defined function (UDF) TOML dependencies.500Failed to read demos from the demos directoriesSchema — OPTIONALdetails objectDetailed error metadata. The contents of this field is determined by error_code.error_code stringError code is a string that specifies this error type.message stringHuman-readable error message.