Support Metalink as alternate multi-value output representation

[fmigneault]

Description

#662 introduces support of multi-value as JSON embedded for WPS, which is easily mapped in OGC API - Processes.

Another representation is Metalink, which can embed multiple file references.
This could also be used as alternate result representation from multipart/related when returning multiple outputs using response=raw (and all outputs are references, or requested by reference via transmissionMode=reference) or Prefer: return=minimal + Accept: application/metalink+xml.

Reuse this code for its generation:

weaver/weaver/utils.py

Line 3619 in f2f0868

def create_metalink(

References

• relates to How to handle "multiple output" #25
• relates to Support response: raw execution results #376