Compute metadata flag to optimize gas.

[Rajwanshi1]

Description

Added compute_metadata flag to compute metadata only when required by the caller. Return val for metadata has been changed to Option<T>.

Test Plan

This proposed change does'nt affect signature of any public func. Hence, existing tests should suffice.

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Type of Change (Check all that apply)

• [ ] protocol change
• [ ] user-visible impact
• [ ] breaking change for a client SDKs
• [ ] breaking change for FNs (FN binary must upgrade)
• [ ] breaking change for validators or node operators (must upgrade binaries)
• [ ] breaking change for on-chain data layout
• [ ] necessitate either a data wipe or data migration

Release notes

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[dariorussi]

@Rajwanshi thanks a lot for the changes! @patrickkuo is going to do a final follow up and then I understand we will take it a push it in, right?

[Rajwanshi1]

Hey guys, let me know if there is any update on this PR