fix(encoding): enable double slash encoding on Azure

[nicojs]

Introduce a new env variable: DOUBLE_ENCODE_SLASHES_IN_PATH. When set to 'true', it double encodes slashes in the role name in the URL path. This is a workaround for IIS based Azure services middleware which seem to decode urls before passing them to the app (resulting in double decoding)

• Data Science / AI --> Data Science %2F AI --> Data%20Science%20%252F%20AI

See https://learn.microsoft.com/en-us/answers/questions/1160320/azure-is-decoding-characters-in-the-url-before-rea

[nicojs]

This solution doesn't work. It seems that IIS doesn't decode other characters.

Data%20Science%20%252F%20AI -> Data%20Science%20%252F%20AI -> Data Science %2F AI (which doesn't exist).

Role names with a slash are not supported.