make `-T` faster

[eval-exec]

Hello, I found eza --tree is very slow (> 5s) on large project, such as: https://github.com/rust-lang/cargo/ And I received Too many open files (os error 24), it seems this is cause eza --tree slow.

[dougg0k]

https://ploi.io/documentation/server/how-do-i-fix-the-too-many-open-files-error

Some terminals may offer a setting in their configurations.

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https://github.com/solidiquis/erdtree Is multi threaded and does a pre-index before listing the tree. Everytime. Could be a reference to take and do improvements.

But it seems to do even in a depth 1 and lacks other options. Eza experience and visualization are still better imo.