Warn user if the app bundle version differs with the current app version

[silvin-lubecki]

- What I did I now check current app version vs bundle app version if any and print a warning if it differs on the following commands:

• inspect
• pull
• rm
• run
• update
• image inspect
• image render

- How I did it I stored a new field "app-version" in the bundle's custom payload section, so I can compare built app image with the current app binary version.

- How to verify it

• Build an app with this PR's binary
• Edit the produced bundle directly in the bundle store (~/.docker/app/bundles/..../bundle.json), find where the custom payload is and change the app-version field
• Inspect this application, the warning should be there

- Description for the changelog

• Warn user if the app bundle version differs with the current app version

- A picture of a cute animal (not mandatory)

[codecov[bot]]

Codecov Report

Merging #769 into master will decrease coverage by 1.56%. The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
- Coverage   72.09%   70.52%   -1.57%     
==========================================
  Files          67       67              
  Lines        3838     3729     -109     
==========================================
- Hits         2767     2630     -137     
- Misses        739      756      +17     
- Partials      332      343      +11

Impacted Files	Coverage Δ
internal/commands/pull.go	64.28% <0%> (-4.95%)	:arrow_down:
internal/commands/run.go	62.36% <0%> (-1.38%)	:arrow_down:
internal/packager/cnab.go	96.98% <100%> (ø)	:arrow_up:
internal/commands/image/inspect.go	66.66% <33.33%> (-2.73%)	:arrow_down:
internal/commands/update.go	56.89% <33.33%> (-2.04%)	:arrow_down:
internal/commands/inspect.go	48.38% <33.33%> (-1.62%)	:arrow_down:
internal/commands/remove.go	50.94% <33.33%> (-2%)	:arrow_down:
internal/commands/image/render.go	67.85% <52.38%> (-1.64%)	:arrow_down:
internal/packager/custom.go	73.33% <87.5%> (+12.04%)	:arrow_up:
internal/commands/build/build.go	60% <0%> (-20.42%)	:arrow_down:
... and 1 more

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