We need to create new Streamlit page. User should be able to upload csv file containing
list of emails, column called requested_date(MM/DD/YY) and then press button "upload".
Before uploading data, following checks should be enforced:
a) check that all rows have requested_date value filled in and that can be converted into date.
b) Emails should be lower cased and validated before upload. Use package https://github.com/bnkc/emval or alternatively
other python email validation package
If any of the rows fails validation then don't complete upload.
User should be given list of emails/dates that failed this constraint.
If everything is ok, Emails and related requested_date should be uploaded to table CCPA_FAN_LIST.
NB! Only one requested_date can be in the CCPA_FAN_LIST table. And it should be oldest date value.
Meaning if one file includes multiple requested_date values then use only oldest one and if CCPA_FAN_LIST
table contains already email with relevant requested_date value then overwrite requested_date only if it's older
than currently existing value.