Cherry Pickings from main to 21.09 Release.#6868

Merged

paulcam206 merged 8 commits intorelease/21.09from

jwoo/release/21.09

Jan 6, 2022

Commits on Dec 14, 2021

Added App extension to podspec (#6849)
jwoo-msft
committed

Commits on Jan 6, 2022

Merge branch 'release/21.09' of github.com:Microsoft/AdaptiveCards into jwoo/release/21.09
jwoo-msft
committed
[iOS] fixed empty filtered list issue (#6528)

jwoo-msft
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licanhua
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moving resource bundle to core (#6853)

authored and
jwoo-msft
committed
Rounding off to 2 decimals (#6863)

shabripabba
authored and
jwoo-msft
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[ios] updated round off logic (#6866)
jwoo-msft
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update test (#6864)

licanhua
authored and
jwoo-msft
committed
added heartbeat test ios build infrastructure (#6842)
jwoo-msft
committed