pam: show password prompt directly on TTY if possible

[shiv-tyagi]

Closes #1230

This makes PAM to write authentication prompt while executing sudo directly to tty in order to make sure it is visible even if stdout/stderr are redirected.

Verified locally, it is working as expected.

<redacted>@authd-test:~$ sudo ls > /dev/null 2>&1
Enter your local password:                                                                                              
> ***                                                                                                                   
                                                                                                                        
  Press escape key to go back to select the authentication method

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.68%. Comparing base (1b9ea6b) to head (e4e96da).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1269      +/-   ##
==========================================
+ Coverage   85.00%   85.68%   +0.67%     
==========================================
  Files         119       99      -20     
  Lines        7669     6685     -984     
  Branches      111      111              
==========================================
- Hits         6519     5728     -791     
+ Misses       1094      901     -193     
  Partials       56       56              

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[3v1n0]

I've another branch ready for this for a while, but I had to delay it for preparing tests, so thanks a lot for your contribution but I'm handling this already.