feat: add is_case_insensitive

[nguymin4]

This PR adds is_case_insensitive variable as optional

is_case_insensitive - - (Optional) TRUE if the dataset and its table names are case-insensitive, otherwise FALSE. By default, this is FALSE, which means the dataset and its table names are case-sensitive. This field does not affect routine references.

Note:

• I ran make generate_docs as instructed in contributing guidelines. It created unrelated changes, e.g. it converted configurationSecs from integer to string (???) in modules/data_warehouse/metadata.yaml. => Therefore, I only committed what make senses.