* save: compiles and tests pass

* save: added global

* done + test

* cleanup

* changelog update

* cleanup

* address feedback, step 1

* address feedback, step 2

* address feedback, step 3

* returned updated gas_estimation_call_runtime test

* clippy fix

* address feedback, step 4

* address feedback, step 5

* move data from context to inputs

* docs fix

* Apply suggestions from code review

Co-authored-by: Alexander Theißen <alex.theissen@me.com>

* address feedback, step 6

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Co-authored-by: Alexander Theißen <alex.theissen@me.com>