Dac tutorial add tech

[gidden]

This is a fresh PR where we will implement DACCS related tutorials. It depends on iiasa/message-ix-models#158 where additional features for implementing DACCS in scenarios are developed.

This supercedes #793 and #806

FYI @ywpratama

Required: write a single sentence that describes the changes made by this PR.

How to review

Required: describe specific things that reviewer(s) must do, in order to ensure that the PR achieves its goal.
If no review is required, write “No review:” and describe why.

PR checklist

• Continuous integration checks all ✅
• Add or expand tests; coverage checks both ✅
• Add, expand, or update documentation.
• Update release notes.

[codecov]

Codecov Report

Attention: Patch coverage is 1.24224% with 159 lines in your changes are missing coverage. Please review.

Project coverage is 92.0%. Comparing base (99422f4) to head (20eca74).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #810     +/-   ##
=======================================
- Coverage   95.4%   92.0%   -3.4%     
=======================================
  Files         46      47      +1     
  Lines       4351    4510    +159     
=======================================
  Hits        4153    4153             
- Misses       198     357    +159     

Files	Coverage Δ
message_ix/util/tutorial.py	100.0% <100.0%> (ø)
message_ix/tools/add_tech/__init__.py	0.0% <0.0%> (ø)

[glatterf42]

Hi @gidden, please clarify for me: I thought we wanted to have the tutorials be part of message-ix-models. Was this decision revised? Should I still set up a docs page etc for tutorials in message-ix-models?

[gidden]

Hey @glatterf42 - good questions. Yes, in reviewing this PR and related work with @ywpratama yesterday, we realized that his add_dac() functionality was more generic and could be applied at a high level repo (similar to add_years() here). That is at least the proposal for now, which we can discuss once the PR is finalized.

So in short, no need to add tutorials page yet to message-ix-models