[s3] use slashes for namespace

[jylin]

Describe the feature

For S3-type storage, slashes are accepted and often used for object keys. Would it be possible to support read/write to keys with slashes?

These 2 places replace slashes with colons, and I checked that commenting those replacements out makes queries for paths with slashes work (haven't tested writes):
https://github.com/unjs/unstorage/blob/main/src/utils.ts#L52
https://github.com/unjs/unstorage/blob/main/src/drivers/utils/index.ts#L18

This would be useful also to be able to access objects written previously not through unstorage that are stored in keys containing slashes (common when using S3 for image hosting).

Additional information

• Would you be willing to help implement this feature?

[jylin]

Awesome, incredibly fast turnaround! I just tested the latest release and the reads and writes work for me as expected! Thanks!