refactor: move striplock to libs/utils package

[VolodymyrBg]

Move the striplock implementation from store package to libs/utils
to make it more reusable across the codebase. This change:

• Creates new StripLock and MultiLock types in libs/utils package
• Adds proper documentation for all exported types and methods
• Maintains backward compatibility through type aliases
• Marks old package-level functions as deprecated

The implementation remains functionally identical, but is now
properly placed in the utils package as suggested by the TODO comment.

Resolves TODO: move striplock to utils

[cristaloleg]

Sounds like #4046