Move render command under image command

[jcsirot]

- What I did
Remove the render command and move it as new image subcommand.

- How I did it
Move render.go into image package.
Bundle parameters merging algorithm is invoked from some root commands and image render command. Therefore the bundle parameters merging had to be move to a dedicated package in order to avoid go package cycles.

- How to verify it

• run docker app render myapp:mytag and ensure the command does not exist
• run docker app image render myapp:mytag and verify the App is rendered

- A picture of a cute animal (not mandatory)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@6f5737a). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #726   +/-   ##
=========================================
  Coverage          ?   71.42%           
=========================================
  Files             ?       59           
  Lines             ?     3178           
  Branches          ?        0           
=========================================
  Hits              ?     2270           
  Misses            ?      602           
  Partials          ?      306

Impacted Files	Coverage Δ
internal/commands/root.go	74.72% <ø> (ø)
internal/commands/image/render.go	72.41% <100%> (ø)
internal/bundle/parameters.go	86.51% <100%> (ø)
internal/commands/update.go	58.18% <100%> (ø)
internal/commands/run.go	61.11% <100%> (ø)
internal/commands/image/command.go	100% <100%> (ø)

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[silvin-lubecki]

LGTM