SEA action diagnostics and status updates

[aromanielloNTIA]

SCOS Actions updates (general):

• Update preselector package to 3.0.1, applying the bug fix from Fix digital input reader Preselector#20
• Bump SCOS Actions version to 6.1.0
• Refactor to use pathlib for all path handling

Updates to the SEA data product action:

• Implements error handling for reading web relay sensors. If the sensor is not configured or returns a "X.X" value, the Exception is skipped and "Unavailable" is marked in the metadata.
• Add "scos_uptime_days" and "scos_start_time" to computer diagnostics metadata
• Convert previous "uptime_hours" computer uptime diagnostic field to "cpu_uptime_days", to distinguish from newly added SCOS uptime field and match its units

Updates to the SEA metadata format:

• The metadata version is updated to v0.3
• Moves data component sample counts to global level
• Moves mean and max channel power summary statistics to global level
• Adds global level object data_products containing processing details for each type of data result, and the IIR filter being used. This reduces redundancy in each metadata file while including more information relevant to the processing.
• Updates diagnostics metadata: convert CPU uptime to days, add fields for SCOS start time and SCOS uptime
• Changes overall reduce metadata size by about 35%, from 20 KB to 13 KB

After merging, a new release should be built and a new equivalent tagged version sea-prototype-v0.3 should be created.

Merging this PR closes #62

Tested and working on seadog01

[jhazentia]

Looks good!

[jhazentia]

get_sigan_calibration() and get_sensor_calibration() appear to be nearly the same. Consider combining in the future.