refactor: Create text copy handler

[TerryHowe]

What this PR does / why we need it:

This is a baby step to creating copy handlers for the cp command

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.48%. Comparing base (7a88524) to head (361025d).

Files	Patch %	Lines
cmd/oras/internal/display/status/text.go	88.88%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1441      +/-   ##
==========================================
- Coverage   85.52%   85.48%   -0.05%     
==========================================
  Files         109      109              
  Lines        3842     3851       +9     
==========================================
+ Hits         3286     3292       +6     
- Misses        333      335       +2     
- Partials      223      224       +1     

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[qweeah]

Still need to add TTY implementation of status.CopyHandler. Not necessarily needed in this PR.

[TerryHowe]

Still need to add TTY implementation of status.CopyHandler. Not necessarily needed in this PR.

If this PR merges, it will be easier to create a tty handler and the successor PR is so bloated.

[qweeah]

LGTM