Adding options to fix industry demands for selected regions (or the globe)

[cchrisgong]

Purpose of this PR

For the IKEA project, we want to be able to provide demand scenarios that separate the global north and global south under 1.5C. The easiest way to achieve this systematically in a controlled way is to implement switch which sets energy service demand to an exogenous value, similar to other projects

This builds on earlier commit https://github.com/remindmodel/remind/commit/13f4026a2f2cd814db04cd548cd27c2d7f698a9d This earlier PR fixes industry demand for the EU, this PR builds on this and generalizes it to any global region.

Instead of hard coding demand, this switch only allows fixing to the baseline (NPi) demand trajectory which comes from input.gdx, and only for industry sector

Type of change

(Make sure to delete from the Type-of-change list the items not relevant to your PR)

• [ ] Bug fix
• [ ] Refactoring
• [X ] New feature
• [ ] Minor change (default scenarios show only small differences)
• [ ] Fundamental change
• [ ] This change requires a documentation update

Checklist:

• [X] My code follows the coding etiquette
• [ X] I performed a self-review of my own code
• [ X] I explained my changes within the PR, particularly in hard-to-understand areas
• [ X] I checked that the in-code documentation is up-to-date
• [ X] All automated model tests pass (FAIL 0 in the output of make test)

Further information (optional):

• Test runs are here: 2C: /p/tmp/chengong/remind_demnoCES/remind/compScen-2C_ind_dem_fx-2024-05-23_10.41.04-H12 1.5C: /p/tmp/chengong/remind_demnoCES/remind/compScen-1p5_ind_dem_fx-2024-05-23_10.44.55-H12

Under switch "cm_fxIndUe = on", "_demfx" scenario fixes industry demand only for CHA, and "_demfxGlo" fixes it for the whole globe, and "_demfxGloS" scenario fixes demand for the global south

• Comparison of results (what changes by this PR?): Nothing changed under default "cm_fxIndUe = off"