Detect IP and time data

[wagner-intevation]

If there is only one column that only contains IP addresses, select it as source.ip automatically.

If there is only one column that only contains date & time, select it as time.source automatically.

This needs to be done entirely in the frontend as the backend does not have the data at this stage.

[wagner-intevation]

• For each column, check if the data field is a valid timestamp or IP address
  • Compute the ratio number of parseable fields / number of non-empty fields
• The first column which contains a ratio of >= 90% timestamps and >= 50% non-empty fields, gets a default column assignment time.source
• The first column which contains a ratio of >= 90% IP addresses and >= 50% non-empty fields, gets a default column assignment source.ip

Or equivalent.

Only check the first 100 rows.