[New Feature]: Enable partial completions in language server

[nadeeshaan]

Description

In the current implementation, we populate all the available completion items. For example, consider the types suggestion in the relevant contexts. In general, we have two or three levels of cascading for sorting. This behaviour gives a very good edge for enabling partial completions.

As an initial improvement, we can consider the types suggestion and limit the number of completion items sending to the client. This can lead us to avoid the unnecessarily large array of completion items as well as save us a significant amount of time.

This also can lead to another future improvement which is enabling the LSIF implementation as well.

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