Add the isInline property to create inline table

[PinYuanChen]

According to the official document, there is a field called is_inline to distinguish whether the database appears in the page as an inline block.
I add this property to the DatabaseCreateRequest for users to create an inline table. I set the default value to false so it won't break the code.

[chojnac]

Not sure if this will work, there is no mention of is_inline in the "Create a database" endpoint description.
Also this property should be added to the Database entity.

[PinYuanChen]

I've tried it by myself and it can successfully create an inline table in the designated page.
You can try it by yourself and make sure it works.
Besides, I also add this property to the Database entity.