Partial retrieval ux improvements

[magik6k]

TODO:

• Cleanup api (keep the path thing in v0 api, use json in v1)
• Add helptext to retrieve command
• retrieve stat command
• retrieve ls command
• retrieve cat command
• Merge with [Proposal] Simplify ClientRetrieveAPIs to mirror storage #6415

[codecov]

Codecov Report

Merging #7610 (bd4927b) into master (3714177) will decrease coverage by 0.25%.
The diff coverage is 34.70%.

@@            Coverage Diff             @@
##           master    #7610      +/-   ##
==========================================
- Coverage   39.60%   39.35%   -0.26%     
==========================================
  Files         635      637       +2     
  Lines       67581    67928     +347     
==========================================
- Hits        26767    26733      -34     
- Misses      36217    36571     +354     
- Partials     4597     4624      +27     

Impacted Files	Coverage Δ
api/api_full.go	47.36% <ø> (ø)
api/types.go	52.77% <ø> (ø)
api/v0api/full.go	0.00% <0.00%> (ø)
api/v0api/v1_wrapper.go	1.14% <0.00%> (-1.08%)	⬇️
cli/client.go	21.31% <ø> (-1.52%)	⬇️
node/rpc.go	27.41% <12.50%> (-3.59%)	⬇️
cli/client_retr.go	21.53% <21.53%> (ø)
node/impl/client/client.go	50.06% <64.39%> (+4.94%)	⬆️
itests/kit/deals.go	77.68% <80.00%> (-0.30%)	⬇️
node/modules/storageminer.go	57.44% <100.00%> (-5.67%)	⬇️
... and 28 more

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[magik6k]

Examples of the new commands:

[arajasek]

remove