Fix Jedi completion fuzzy config doesn't work

[mossisnotwhy]

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

1. Modify the config of python-lsp-server in spyder\config\lsp.py. Set the fuzzy config of jedi_completion default True.
2. Modify the check_can_complete function in spyder\plugins\editor\widgets\completion.py. Allow completion suggestions do not start with current word.
3. Modify the process_completion method in spyder\plugins\editor\widgets\codeeditor\lsp_mixin.py. Use a new sort key for fuzzy completion suggestions.

Issue(s) Resolved

Fixes #11535

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mossisnotwhy