Include sample encoding info and fps in crf-seach & auto-encode progress bars

[alexheretic]

• Add sample-encode info to crf-search. Show sample N/M run progress and encoding/vmaf fps.

  ⠤ 00:00:30 crf 19 1/2 ###############################----------- (vmaf 19 fps, eta 77s)
  

• Similarly add sample-encode info to auto-encode.

  ⠂ 00:00:51 crf 31 2/2 ########################################## (VMAF 95.03, size 21%)
  ⠤ 00:00:09 Encoding #######------------------------------------------- (12 fps, eta 3m)
  

• Tweak sample-encode progress bar format to be more consistent.

Resolves #219