[Bug] Handle Strings Properly in PostgresResultIteratorWithMetaData

[suddendust]

PostgresResultIteratorWithMetaData has a bug on line 822 wherein Jackson's Object Mapper tries to deserialise a string but throws a JsonParsingException. The problem here is that we are passing the string without escaping the double quotes. This needs to be fixed.

document-store/document-store/src/main/java/org/hypertrace/core/documentstore/postgres/PostgresCollection.java

Line 822 in 4df34ac

JsonNode leafNodeValue = MAPPER.readTree(columnValue);

Note: We need to check the column type and escape only if it is a text column. For other numeric cols, it shouldn't be escaped.