llms: Add fake package

[devalexandre]

PR Checklist

• [x] Read the Contributing documentation.
• [x] Read the Code of conduct documentation.
• [x] 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).
• [x] 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.
• [x] Contains test coverage for new functions.
• [x] Passes all golangci-lint checks.

[eliben]

You checked " Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).", but in fact it's not clear at all what and why this is doing.

Also, the code is full of Portuguese comments and strings, is this intentional?

[devalexandre]

You checked " Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).", but in fact it's not clear at all what and why this is doing.

Also, the code is full of Portuguese comments and strings, is this intentional?

sorry , I'll update to en and edit the list