Bmi-era5

- update notebook for example code and config yaml file
- allow loading a local .nc file as a data component
- fix the bug when the grid only includes 1 coordinate value for lat and lon

- bug fix for the variable dtype when there is scale factor for the variable.

- update notebook
- update util.py to make the time values as float

- add cds api installation file
- enable binder
- update documentation

This is the first release of the bmi_era5 package.