refactor: Move printer to output package

[TerryHowe]

What this PR does / why we need it:

The printer is supposed to be a very generic output object and this change moves in that direction.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.06%. Comparing base (8027e16) to head (c880581).

Files	Patch %	Lines
cmd/oras/root/cp.go	50.00%	0 Missing and 2 partials ⚠️
cmd/oras/internal/display/status/text.go	66.66%	0 Missing and 1 partial ⚠️
cmd/oras/internal/display/status/tty.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1394   +/-   ##
=======================================
  Coverage   85.06%   85.06%           
=======================================
  Files         107      107           
  Lines        3804     3804           
=======================================
  Hits         3236     3236           
  Misses        339      339           
  Partials      229      229           

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[qweeah]

@TerryHowe What kind of problem is expected to be resolved by this PR? Moving print-related utilities out of status folder is doable, but status package including the handlers should be placed side-by-side with metadata in the same folder level.

Types of output

• Status output of the operation
• Metadata output of the operation
• Content output (non-relevant to this PR)

Taking pull artifact as an example:

• Status output: progress bar
• Metadata output: showing what has been pulled (e.g. filename, digest ...)
• Content output: the artifact content save as a file (non-relevant to this PR)

$ oras pull --oci-layout hello:latest --no-tty
Downloading a948904f2f0f hello.txt
Downloaded  a948904f2f0f hello.txt
Pulled [oci-layout] hello:latest
Digest: sha256:6ca2cbb8dc842320c8b9ae609dfb2f9a83eb0be382cbc0c75c6bbdd51a15b242

Status output:

Downloading a948904f2f0f hello.txt
Downloaded  a948904f2f0f hello.txt

Metadata output:

Pulled [oci-layout] hello:latest
Digest: sha256:6ca2cbb8dc842320c8b9ae609dfb2f9a83eb0be382cbc0c75c6bbdd51a15b242

[TerryHowe]

I just created this PR to give better separation of concerns and avoid possible circular dependencies. The Printer is a like a logging system and really shouldn't be dependent on what it logs.

[qweeah]

@TerryHowe Got it, then this PR should only move print.go and print_test.go

[qweeah]

LGTM