Update esacci-soilmoisture(v08.1) downloader and CMORizer (Python version)

[diegokam]

Description

This PR provides an updated downloading script and a new formatting script for ESACCI SOILMOISTURE v08.1 data (montly) in Python replacing the old NCL version supporting montly data by including only sm and smStderr variables.

Checklist

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• [ ] 🛠 This pull request has a descriptive title
• [ ] 🛠 Code is written according to the code quality guidelines
• [ ] 🛠 Documentation is available
• [ ] 🛠 Tests run successfully
• [ ] 🛠 The list of authors is up to date
• [ ] 🛠 Any changed dependencies have been added or removed correctly
• [ ] 🛠 All checks below this pull request were successful

New or updated data reformatting script

• [ ] 🛠 Documentation is available
• [x] 🛠 The dataset has been added to the CMOR check recipe
• [ ] 🛠 The dataset has been added to the shared data pools of DKRZ and Jasmin by the @ESMValGroup/OBS-maintainers team
• [ ] 🧪 Numbers and units of the data look physically meaningful

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