Add source from Statistics Canada

[charphi]

API documentation: https://www.statcan.gc.ca/en/developers/wds

SdmxWebSource:

Key	Value
Name	STATCAN
Description	Statistics Canada
Aliases
Driver
Dialect
Endpoint	https://www150.statcan.gc.ca/t1/wds/rest
Properties
Website	https://www150.statcan.gc.ca/n1/en/type/data?MM=1
Monitor

Problems:

• doesn't follow standard REST API
• stores frequency in an annotation instead of dimension or attribute

[charphi]

Done in fb45975

[CyLuGh]

Seems like there are still some troubles with the source:

sdmx-dl list concepts STATCAN 'StatCan:DF_10100139(1.0)' will throw an IOException: Invalid series key '.'

sdmx-dl fetch data STATCAN 'StatCan:DF_10100002(1.0)' '1.1' does have some null data... and I wonder if the symbol used is not yet again something else (might be caused by my recent update to .net 6), I'll have to check.

[charphi]

So, after verification, there are three distinct problems:

• The command-line parsing of single quote doesn't work as
• StatCanDriver doesn't validate its DataflowRef input
• Data parsing is failing due to an invalid xml file