Add basemap control component in mapper frontend + opfs pmtile support (pt1)

[spwoodcock]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧑‍💻 Refactor
• ✅ Test
• 🤖 Build or CI
• ❓ Other (please specify)

Related Issue

Start towards #1437
Related to #1552 (easy fix in pt2).

Describe this PR

Part 1 of two PRs. In this one I:

• Add a basemap component to the offline tab.
• Allows for downloading existing tiles.
• If mbtiles, then offer download option.
• If pmtiles, then two options display:
  • Show in map (online).
  • Download to opfs for offline display.
• Both options use the baselayer switcher.
• The pmtile layer is added as a baselayer to select.

In pt2 I will:

• Update the file path storage for basemaps in the db.
• Migrate all existing basemaps to S3.
• Populate the url field correctly with the S3 URL.
• Possibly also rename all.pmtiles opfs file to offline.pmtiles?

Review Guide

• Create a pmtiles archive on management (react) frontend.
• Go to mapper frontend offline tab.
• View the options there.
• Select pmtiles, then display.
• Select mbtiles, then download.

Checklist before requesting a review

• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
• 📖 Read the HOT Code of Conduct: https://docs.hotosm.org/code-of-conduct
• 👷‍♀️ Create small PRs. In most cases, this will be possible.
• ✅ Provide tests for your changes.
• 📝 Use descriptive commit messages.
• 📗 Update any related documentation and include any relevant screenshots.

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