☂️ Import sorter revamping - custom order

[Conaclos]

Description

We recently published an RFC to improve the Biome import sorter.

This issue tracks the implementation of the RFC.
The main goal of this implementation is to:

• Allow specifying a custom order based on groups
• Allow adding blank lines between some groups.
• Allow merging imports
• Allow sorting export from statements

We will provide a legacy configuration to enable the old way of sorting imports.
By disabling this configuration, the new system will be used.

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