feat: [CN-29] remove the support of complex64/complex128

[vpakhuchyi]

Pull request

Link to the related ticket

https://censor.atlassian.net/browse/CN-29

Description of changes

Remove the support of complex64/complex128 due to the maintenance issues.
Main reasons:

• these types can't be represented as a JSON values with no custom implementations
• it's hard to have the predictable rounding during the formatting (unlike with floats) that damages the consistency of the output

Checklist

Please ensure that your pull request complies with the following requirements:

• The changes have been tested locally (if applicable).
• The documentation has been updated (if applicable).