--installer-context option is experimental

[ndeloof]

- What I did
Made installer-context option experimental

- How I did it
Annotate as experimental:true

- How to verify it
if experimental is disabled, option is not available

- Description for the changelog
installer-context option is experimental

- A picture of a cute animal (not mandatory)

[codecov]

Codecov Report

Merging #733 into master will decrease coverage by 0.66%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
- Coverage   69.72%   69.05%   -0.67%     
==========================================
  Files          64       63       -1     
  Lines        3495     3400      -95     
==========================================
- Hits         2437     2348      -89     
- Misses        738      741       +3     
+ Partials      320      311       -9

Impacted Files	Coverage Δ
internal/commands/validate.go	75% <100%> (ø)	⬆️
internal/cliopts/installerContext.go	27.58% <100%> (+2.58%)	⬆️
internal/commands/root.go	63.95% <16.66%> (-10.75%)	⬇️
internal/commands/image/list.go	83.67% <0%> (-4%)	⬇️
internal/packager/custom.go
internal/packager/cnab.go	97.94% <0%> (+0.27%)	⬆️
types/parameters/parameters.go	93.65% <0%> (+1.58%)	⬆️

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[silvin-lubecki]

LGTM