Resolves #7193

Step 1 of implementing an addon for Open Streetmaps. I've copied the Google Maps addon, stripped out most of the logic, and renamed things to refer to Open Streetmaps. Additional PRs coming soon.

Please make sure to read the Contributing Guidelines:

https://github.com/neomjs/neo/blob/dev/CONTRIBUTING.md

What kind of change does this PR introduce? (check at least one)

• Bugfix
• [x ] Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• [x ] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [x ] It's submitted to the dev branch, not the main branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• [ x] A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information: