Prep for v0.9.7

[jinningwang]

This patch release add the Roadmap section in the release notes, to list out some potential features.
It also drafts the EV Aggregation model based on the state space modelg, but the finish date remains unknown.

References:

[1] J. Wang et al., "Electric Vehicles Charging Time Constrained Deliverable Provision of Secondary
Frequency Regulation," in IEEE Transactions on Smart Grid, doi: 10.1109/TSG.2024.3356948.

• Fix OTDF calculation
• Add parameter dtype='float64' and no_store=False in MatProcessor PTDF, LODF, and OTDF calculation, to save memory
• Add placeholder parameter Bus.type

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -4.00% (target: -10.00%)	✅ 51.88% (target: 10.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (fcc7e57)	11165	6344	56.82%
Head commit (783f8c7)	12006 (+841)	6342 (-2)	52.82% (-4.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#83)	266	138	51.88%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 44.58874% with 128 lines in your changes missing coverage. Please review.

Project coverage is 77.79%. Comparing base (fcc7e57) to head (783f8c7).
Report is 95 commits behind head on master.

Files	Patch %	Lines
ams/extension/eva.py	15.32%	116 Missing ⚠️
ams/core/matprocessor.py	84.37%	5 Missing ⚠️
ams/routines/dcpf.py	50.00%	5 Missing ⚠️
ams/io/matpower.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   79.53%   77.79%   -1.74%     
==========================================
  Files          58       61       +3     
  Lines        4944     5115     +171     
==========================================
+ Hits         3932     3979      +47     
- Misses       1012     1136     +124     

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