Feature pam tty

[squell]

Closing #223; note: this builds on #221, that should be reviewed and merged first.

Also, #193 should be merged first, and will give two easily solved merge conflicts.

[codecov]

Codecov Report

Patch coverage: 34.88% and project coverage change: -0.11 ⚠️

Comparison is base (483a094) 76.58% compared to head (df448af) 76.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   76.58%   76.48%   -0.11%     
==========================================
  Files          37       37              
  Lines        4609     4657      +48     
==========================================
+ Hits         3530     3562      +32     
- Misses       1079     1095      +16     

Impacted Files	Coverage Δ
lib/sudo-pam/src/lib.rs	0.34% <0.00%> (ø)
sudo/src/pam.rs	0.00% <0.00%> (ø)
lib/sudo-pam/src/converse.rs	85.59% <15.78%> (+0.36%)	⬆️
lib/sudo-pam/src/rpassword.rs	34.06% <40.32%> (+34.06%)	⬆️
lib/sudo-common/src/context.rs	94.73% <100.00%> (+0.14%)	⬆️
lib/sudo-pam/src/securemem.rs	98.38% <100.00%> (ø)

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