Function to update cohort names in Shiny app

[laacri]

Write a general function to update the cohort names in the Shiny app. Potential options to include:

1. Pass a name mapping as a parameter
2. Reading the name mapping from file if available (what type of file? Excel, json, txt ...?)

Notes:

• Already tried to update the names when forming the cohorts, but it turned out to be tricky: I got a warning that "cohort_name must be snake case and less than 100 characters" and the cohorts were renamed automatically.
• The snake case is more solid than names potentially containing spaces and special characters, so it's probably better to leave it unchanged during code execution.
• The safest choice would then be to update the names in the final summarised result, once all computation is done.