Create Release Notes for 1.4

[danuw]

What happened?

What happened?

Create a PR with updated change log.
Will look for PRs and Issues since last release.

Please feel free to add anything missing in the comments...

I used the following commands to help

gh pr list -R Green-Software-Foundation/carbon-aware-sdk --search "-label:agenda closed:>=2024-03-06" --json number,title,url --template \
        '{{range .}}{{ printf "\n-[PR #%v]" .number | autocolor "green"}} {{.title}} {{ printf "](%v)" .url}}{{end}}'

gh issue list -R Green-Software-Foundation/carbon-aware-sdk --search "-label:agenda closed:>=2024-03-06" --json number,title,url --template \
        '{{range .}}{{ printf "\n-[#%v]" .number | autocolor "green"}} {{.title}} {{ printf "](%v)" .url}}{{end}}'

Code of Conduct

• I agree to follow this project's Code of Conduct

Feature Commitment

• I commit to contributing this feature as a PR and working with the GSF to merge this feature into the Carbon Aware SDK.

[Sophietn]

@danuw do you have an update to share with us on v1.4 release notes? Thanks