Add exclude options for `poetry new`

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Feature Request

Add exclude options for poetry new.

My usual workflow is as follows.

1. Make a repo at GitHub and pull it to my local machine.
2. Add python package with poetry.

However,
poetry init is not enough.
poetry new returns FileExistsError since 1st step create .git and LICENSE,

I want to exclude .git and LICENSE from the poetry new limitation and utilize poetry new for 2nd step.

My proposal is as below.

1. Add exclude to config in a form of a list.

exclud_pattern = ['.git', 'LICENSE']

2. Modify check workflow in src/poetry/console/commands/new.py

- if path.exists() and list(path.glob("*")):
+ glob_all = [str(p.relative_to(path)) for p in path.glob("*")]
+ if path.exists() and len(set(glob_all + exclude_pattern)) > len(exclude_pattern):
      # Directory is not empty. Aborting.
      raise RuntimeError(
          f"Destination <fg=yellow>{path}</> exists and is not empty"
      )

Start with the poetry new entry point in src/poetry/console/commands/new.py and trace how destination contents are checked and how configuration is loaded. Define the exclusion behavior for existing .git and LICENSE entries, then verify that poetry new accepts those contents while still rejecting other non-empty destinations.