Restrict users to join the hike

**Is your feature request related to a problem? Please describe.**
When someone creates a hike, it is visible to all the users nearby with the passkey. And hence anyone can join the hike. Isn't it a possible threat to the security of the persons in the hike as one can join that hike with the given passkey

**Describe the solution you'd like**
Though the nearby beacons should be visible to others, the passkey should not be visible to the other people in the nearby section of the app.

**Describe alternatives you've considered**
The simplest approach to deal with this problem is to hide the passkey from the nearby beacons section, and for better security even don't call the data from the API's itself. If discussion approves of the feat I suggested. I can start working on this.

**Additional context**

Using Android 11 (physical device)

**Are you working on this? (Yes/No)**
Yes