Use STATCAN SDMX API instead of WDS API

[charphi]

STATCAN now has an SDMX-compliant API to access data and metadata.
See https://www.statcan.gc.ca/en/developers/sdmx/user-guide

The current driver uses the STATCAN WDS API.

[charphi]

Two additional endpoints (see amattioc/SDMX#225 (comment)):

https://api.statcan.gc.ca/census-recensement/profile/sdmx/rest (Census Profile Data)
https://information-energie.canada.ca/sdmx/rest (Canadian Center of Energy Information)

[charphi]

Important

The SDMX API side of WDS doesn't allow to retreive data flows.

[charphi]

Additional endpoints in specific issues: #1055 #1056