feat(expr): allow any Error returned by functions

[wangrunji0408]

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What's changed and what's your intention?

This PR allows any error type returned by functions (as a simpler solution of #14159).
One of the benefit is that the openssl dependency can be removed from expr_core, speeding up the build slightly.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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Release note

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[BugenZhao]

Shall we also include the backtrace?

Suggested change

	#[error("{0}")]
	Function(#[source] Box<dyn std::error::Error + Send + Sync>),
	#[error(transparent)]
	Function(#[source] #[backtrace] Box<dyn std::error::Error + Send + Sync>),