Add alternate estimator for Stationary Combustion / Oil and Gas Extraction based on Statistics Canada tables

From https://planzero.ca/blog/2026-03-11-og-extraction

This is different from the methodology described in the Annex 3.1 to the NIR which is based on Statistics Canada tables 25-10-0030-01 Supply and demand of primary and secondary energy, 25-10-0026-01 Supply and demand of natural gas liquids, and 25-10-0085-01 Estimated additions to still gas, diesel and petroleum coke but it seems to get the same result, at least for recent years. The advantage of the methodology presented here is that the petrinex data and GHGRP data is updated more frequently, and the petrinex data may be more actionable in that emissions are listed by facility type, and even by specific facility. Of course, the disadvantage of the methodology here is of course that it does not extend as far back in time: petrinex downloads are only available as far back as 2022.

There is some design work here, in that it may be the first sector to have multiple implementations / estimators.

Start with the methodology described at https://planzero.ca/blog/2026-03-11-og-extraction and compare it with the linked Statistics Canada tables and Annex 3.1 to the NIR. Review how Petrinex and GHGRP data support Stationary Combustion / Oil and Gas Extraction estimates, including the 2022 history limit. Done means the project has a defined alternate estimator and a clear approach for supporting multiple estimator implementations.