Refactor photosynthesis subpackage

[nfahlgren]

Is your feature request related to a problem? Please describe.
Improve the efficiency (speed and memory usage) of photosynthesis related tools and support additional measurement types.

Describe the solution you'd like

• Read RFP and GFP datasets separately into simpler data types
• Refactor PSII_data to support lazy loading of datasets Lazy load chlorophyll #1927
• Lazy-load CHL (chlorophyll) data as a single named numpy array Lazy load chlorophyll #1927
• Lazy-load CLR (color) data as a single named BGR numpy array Lazy load color #1928
• Lazy-load APH (alpha) data as two named numpy arrays Lazy load alpha #1929
• Lazy-load PSD and PSL data as two named numpy arrays each for OJIP and NPQ calculations Load OJIP data on-demand #1939
• Create analyze.yii_ojip function for PSD and PSL data
• Lazy-load PMD and PML data as two named numpy arrays each for PAM and NPQ calculations
• Create analyze.yii_pam function for PMD and PML data (and PMT later)
• Lazy-load PMT data