Sanitize NestJS Input in all the API Controllers

**Describe the task**

Currently, the input received in the API controllers is handling validations by using decorators. But the sanitization of the received input is not happening. For example, input parameters like firstName, lastName etc (string) need to be trimmed before using them as a part of the logic in code.

One way to do this globally for all inputs across all controller endpoints could be to create global pipes like creating a `TrimPipe` to trim the inputs and likewise for other types of sanitizations as needed.

**Reference Links:**

https://stackoverflow.com/questions/63766390/using-nest-js-i-would-like-to-trim-all-body-input-values
https://stackoverflow.com/questions/64313399/how-to-properly-sanitize-nestjs-input

Start by locating the NestJS API controllers and the existing global validation setup. Check how controller inputs are currently validated, then verify that string inputs are sanitized consistently across endpoints and confirm the behavior with the project's existing controller tests, if available.

Written by the indexing model from the issue text.