[BitSail][Features] Support type definition case-independent

[liuxiaocs7]

Is your feature request related to a problem? Please describe

Current the type name of column must be consistent in engine-type-converter.yaml and columns

Describe the solution you'd like

Support type definition case-independent, use lower case uniformly

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[liuxiaocs7]

@hk-lrzy Do you think this modification is OK? cc: @kyle-hawk