Added importing existing server

[jasonw930]

Description

Code for importing existing server when creating instance

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Note: make sure your files are formatted with rust-analyzer

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[seliayeu]

When I paste the absolute path to the server whose server.properties I want to use on my Windows machine (D:\Lodestone\My Server-506d951c), I get the error

2023-11-14T03:03:05.031056Z ERROR lodestone_core::implementations::minecraft: core\src\implementations\minecraft\mod.rs:479: Could not copy existing server for instance

Am I using the right path?