change all quotes to smart quotes within error messages

[jimexist]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

so far some of the test messages require escaping either single ' or double " quotes. this is error prone and and sometimes introduces confusions.

Describe the solution you'd like

we can easily resolve this issue by replacing all current and future usage of quotes into smart quotes ‘ ’ and “ ”

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

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[jimexist]

@Dandandan @alamb @houqp and @jorgecarleitao WDYT?

[Dandandan]

I am not sure changing the error messages for the sake of easier testing makes sense to me.

What about using raw string literals in the tests instead?https://rahul-thakoor.github.io/rust-raw-string-literals/

[jimexist]

I am not sure changing the error messages for the sake of easier testing makes sense to me.

What about using raw string literals in the tests instead?https://rahul-thakoor.github.io/rust-raw-string-literals/

it's a great point - i'll close this in #581