[FEATURE] experimental column map expectation checking for vectors

[manyshapes]

Changes proposed in this pull request:
Adding an expectation that can check if column values are vectors: lists with more than two numbers and no strings.

After submitting your PR, CI checks will run and @tiny-tim-bot will check for your CLA signature.

For a PR with nontrivial changes, we review with both design-centric and code-centric lenses.

In a design review, we aim to ensure that the PR is consistent with our relationship to the open source community, with our software architecture and abstractions, and with our users' needs and expectations. That review often starts well before a PR, for example in github issues or slack, so please link to relevant conversations in notes below to help reviewers understand and approve your PR more quickly (e.g. closes #123).

Previous Design Review notes:

• none

Definition of Done

Please delete options that are not relevant.

• [x ] My code follows the Great Expectations style guide
• [x ] I have performed a self-review of my own code
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation

[netlify]

✔️ Deploy Preview for knoxpod ready!

🔨 Explore the source changes: e36ab2c

🔍 Inspect the deploy log: https://app.netlify.com/sites/knoxpod/deploys/60e7bac476542300082d6841

😎 Browse the preview: https://deploy-preview-3006--knoxpod.netlify.app

[manyshapes]

Resubmitting with different code