Support for Cloudflare's D1 and/or R2

## Feature Description

Cloudflare has been developing an alternative to traditional storage providers, with the benefit that it has no egress fees for the data.

- [**D1**](https://developers.cloudflare.com/d1) is a relational database build on SQLite, which currently is on Alpha. It can be access and manipulated through the online GUI on [Cloudflare's Dashboard](https://dash.cloudflare.com/) or through the CLI using a npm package called [wrangler](https://github.com/cloudflare/workers-sdk/tree/main/packages/wrangler).
- [**R2**](https://developers.cloudflare.com/r2) is the Cloudflare's implementation of an object storage service. It can be used through the GUI on [Cloudflare's Dashboard](https://dash.cloudflare.com/), through the CLI with [wrangler](https://github.com/cloudflare/workers-sdk/tree/main/packages/wrangler), or using the [Amazon's S3 API](https://aws.amazon.com/s3/).

## Proposal

1. First the easiest, R2. To begin with, test if Apache Libcloud [`libcloud.storage.drivers.s3`](https://libcloud.readthedocs.io/en/stable/apidocs/libcloud.storage.drivers.html#module-libcloud.storage.drivers.s3) works correctly with an R2 bucket, and if so, update the documentation to reflect that said module can be used with R2. It would be a good idea to document what functions are NOT available, according to Cloudflare's R2 [documentation](https://developers.cloudflare.com/r2/data-access/s3-api/api/).
2. If `libcloud.storage.drivers.s3` doesn't work with R2, another module can be created (`libcloud.storage.drivers.r2`, for example), which is based on the S3's module but with a few adjustments, and removing functions that are unavailable on R2. I do think this is a cleaner solution, to keep S3 separated from R2.
3. Finally, as Apache Libcloud does not (yet) manage Cloud Databases, a fine addition to the library would be to start a new module (maybe `libcloud.sql.*`?) and implement certain popular SQL Databases, such as [Amazon's RDS](https://aws.amazon.com/rds/), [Azure's SQL Database](https://azure.microsoft.com/en-us/products/azure-sql/database/), and of course Cloudflare's D1.

Bắt đầu bằng cách xem xét libcloud.storage.drivers.s3 dựa trên tài liệu S3 API của Cloudflare R2 và xác định liệu có thể ghi lại khả năng tương thích hiện có hay cần một module libcloud.storage.drivers.r2 riêng. Đề xuất rộng hơn cũng gợi ý thiết kế libcloud.sql.* cho D1 và các cơ sở dữ liệu SQL được quản lý khác; công việc được xem là hoàn tất khi phạm vi, việc triển khai, các bài kiểm thử và tài liệu đã được thống nhất.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.