Catch errors from xlrd reading import rows and return errors with row numbers

[rowanseymour]

• Fixes display of errors
• Adds row numbers to error messages
• Catch date parsing errors within library

Before:

After:

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: temba/contacts/models.py

Function	Unhandled Issue
try_to_parse	UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 193: character maps to ... Event Count: 5

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (242af0b) to head (cccd364).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5405 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 503 503 Lines 25156 25162 +6 ========================================= + Hits 25156 25162 +6 ```

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