feat: interpolate {datetime} in if sel includes {dim}={datetime}

[hrodmn]

Before this change, it was impossible to use the time series API for datasets that needed sel: time={timestamp}. I originally tried adding a time series API query parameter to explicitly pass the datetime parameter onto the array of sel values (#76), but it was clunky and I thought a string interpolation approach would be more flexible and easier to specify in downstream applications.

Now if a user provides time={datetime} in the sel array, titiler-cmr will automatically pluck the datetime query parameter value and interpolate it into the time= string. I put some examples in the notebooks.

I think this is a good idea for titiler-cmr because temporal queries are a critical component of the whole application and extending the datetime parameter to be useful within the sel context will make it more useful for at least two datasets 😅 .

[github-actions]

📚 Documentation preview will be available at: https://developmentseed.github.io/titiler-cmr/pr-previews/pr-78/

Status: ✅ Preview is ready!

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