Add an option to filter out transitive dependencies while checking for updates to available packages

[feierabend654]

• I have searched the issues of this repo and believe that this is not a duplicate.
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Feature Request

Whenever I want to see which packages can be updated, I do poetry show -o . But this command list also updates to transitive dependencies. As I only want to update packages which are directly referenced by me in pyproject.toml i.e. maybe we can offer filtering out the transitive dependencies i.e dependencies of dependencies

Below is an example of a dependency which is brought in by fastapi transitively, but I am already on the latest version of fastapi

$ poetry show -o 
starlette 0.14.2 0.16.0 The little ASGI library that shines.

[mkniewallner]

Duplicate of #4175.

[github-actions]

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