poetry-search: add page

[znarfm]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):
• Reference issue: Let's document: poetry #18042

[acuteenvy]

If searching the PyPI always fails (like pip search), then add an option to specify a custom index. It doesn't make sense to have examples that don't work.

Like in here:

tldr/pages/common/pip-search.md

Lines 7 to 9 in 912712f

	- Search for packages using a custom package index:
	`pip search {{[-i|--index]}} {{example.com}} {{query}}`

[znarfm]

poetry search does not seem provide a way to modify where to search

> poetry search --help

Description:
  Searches for packages on remote repositories.

Usage:
  search [options] [--] <tokens>...

Arguments:
  tokens                     The tokens to search for.

Options:
  -h, --help                 Display help for the given command. When no command is given display help for the list command.
  -q, --quiet                Do not output any message.
  -V, --version              Display this application version.
      --ansi                 Force ANSI output.
      --no-ansi              Disable ANSI output.
  -n, --no-interaction       Do not ask any interactive question.
      --no-plugins           Disables plugins.
      --no-cache             Disables Poetry source caches.
  -P, --project=PROJECT      Specify another path as the project root. All command-line arguments will be resolved relative to the current working directory.
  -C, --directory=DIRECTORY  The working directory for the Poetry command (defaults to the current working directory). All command-line arguments will be resolved relative to the given directory.
  -v|vv|vvv, --verbose       Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug.

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Also, as said in #18042 (comment), searching seem to work fine for now.