Make property case insensitive

[andyfengHKU]

Description

This PR contains the following changes

Make property case insensitive

We have already make table name case insensitive, it does not make sense for our property to remain case sensitive. So we start applying case-insensitive-map everywhere when binding properties.

Remove property_id_t

We use to have an o_id like identifier for property, i.e. property_id_t. Though I start to realize this is unnecessary. We could just use property name as the identifier since property should be unique within a table.

Fixes # (issue)

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