Add CSV Source

[jannden]

Closes #52 , https://github.com/famedly/product-management/issues/2038

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[github-actions]

LCOV of commit d194640 during Rust workflow #376

Summary coverage rate:
  lines......: 86.9% (1139 of 1310 lines)
  functions..: 51.0% (270 of 529 functions)
  branches...: no data found

Files changed coverage rate:
                     |Lines       |Functions  |Branches    
  Filename           |Rate     Num|Rate    Num|Rate     Num
  =========================================================
  src/config.rs      |96.2%    213|57.1%    98|    -      0
  src/sources/csv.rs |93.4%    151|56.7%    60|    -      0
  src/sources/ldap.rs|95.9%    319|59.3%   135|    -      0
  src/user.rs        |89.7%     68|54.5%    22|    -      0
  src/zitadel.rs     |76.7%    317|31.7%   120|    -      0

[jannden]

The requirements were clarified and confirmed with the only stakeholder at the moment - the Marketing team. Task specified #52
Namely:

• only importing new users,
• skipping import for users that already exist,
• reading CSV file from disk,
• CSV data format: email,first_name,last_name,phone

[emgrav]

UKF wants a similar feature, apparently. See the linked issue above. I think it would make sense to add fields for organization, project, and role.

Sorry about not catching this issue earlier

[nikzen]

UKF wants a similar feature, apparently. See the linked issue above. I think it would make sense to add fields for organization, project, and role.

Sorry about not catching this issue earlier

@emgrav THis is not required right now for UKF - so we can keep it as it is