Add ability to push multiple tables without reopening the file every time

[adecler]

Issues addressed by this PR

Closes #53

Test files

EC_Report_SpeedTest.zip

This proves to be especially relevant when the Excel adapter is used by another toolkit to produce report.
So, the best way to test this is via this PR: https://github.com/BuroHappoldEngineering/StructureEmbodiedCarbon_Toolkit/pull/31

I recommend to test the Excel PR first without the other one to make sure everything is still working when pushing one table at a time. Once that confirmed to be working, recompile the other repo using the PR and confirm that the component is still working and is faster. Personally, I got this computational time:

[adecler]

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[adecler]

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[FraserGreenroyd]

Discussed with @adecler and @alelom today amongst various other things and we're in agreement with the plan to merge these for now to unblock @adecler on the work he's doing, with @alelom and others having a planning session and this issue to further enhance the adapter to unblock various aspects which this work has highlighted.

Happy to approve for now and we can rename PushItem to something better before the beta if we don't resolve the above but it's all planned in 😄

[FraserGreenroyd]

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