add `get_occ_ALL()` (Read)

[bbest]

get_occ_ALL(dir_out = here::here(“data”)) Get all OBIS occurrences for thorough analyses.

• Look for expression obis_20220404.parquet.
• Download if doesn't exist from https://obis.org/data/access/
  • Add file to .gitignore.
• Read if exists
• Return result of reading it in