Add implementation of "buffer_window" and "redisChatMessage History"

[MAlj11]

PR Checklist

• [x] Read the Contributing documentation.
• [ ] Read the Code of conduct documentation.
• [ ] Name your Pull Request title clearly, concisely, and prefixed with the name of the primarily affected package you changed according to Good commit messages (such as memory: add interfaces for X, Y or util: add whizzbang helpers).
• [ ] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [ ] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).
• [ ] Describes the source of new concepts.
• [ ] References existing implementations as appropriate.
• [ ] Contains test coverage for new functions.
• [ ] Passes all golangci-lint checks.

[MAlj11]

Can you please merge my commits into the main branch?

[eliben]

This PR seems to be adding a lot of new code without explaining what the code is for and what problem it's trying to solve.

You've also ignored the PR creation checklist which - among other things - asks you to provide such an explanation.

Can you start with an issue that explains what is missing and how you propose to fix it?