inf and NaN fixes

[krkeshav]

Please do not open a pull request without first filing an issue and/or discussing the feature directly with the project maintainer.

Please ensure you adhere to every item in this list

• This PR was pre-approved by the project maintainer
• I have self-reviewed the code
• I have added all necessary tests

Describe your changes

I have added check for NaN and infinity, using math package

Issue number and link

#793

[krkeshav]

@tidwall This resulted in a downtime as we received few bot requests which had NaN in params and apparently strconv.ParseFloat doesn't return error with NaN and infinities.
Hence, the intersect query was taking few seconds to return and this choked the entire flow.

Let me know if I need to do any other changes. Although UTs are passing in my local, but there are no test files for files where I made changes.

[tidwall]

@krkeshav To maintain compatibility we'll probably need to fix the underlying issue, which is not to allow inserting NaN points into the rtree.