plumbing: index, Entries converted in a slice of pointers

[mcuadros]

In order to provide a nicer API, index.Entries was converted to []*Entry

[alcortesm]

Awesome!

[alcortesm]

Now you can simplify worktree_status.go:219-231 a lot, and also make it much more efficient and you no longer has to pass the index to the doUpdateFileToIndex function, as it didn't make any sense, just pass the entry you want to update and the data to update it.

[smola]

Maybe it makes sense to do what @alcortesm proposed in this same PR?

[codecov]

Codecov Report

Merging #364 into master will decrease coverage by 0.7%.
The diff coverage is 78.94%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
- Coverage   77.28%   76.58%   -0.71%     
==========================================
  Files         122      122              
  Lines        8518     8519       +1     
==========================================
- Hits         6583     6524      -59     
- Misses       1198     1271      +73     
+ Partials      737      724      -13

Impacted Files	Coverage Δ
plumbing/format/index/encoder.go	77.14% <100%> (ø)	⬆️
worktree.go	64.52% <100%> (ø)	⬆️
plumbing/format/index/index.go	26.31% <100%> (ø)	⬆️
plumbing/format/index/decoder.go	67.54% <100%> (ø)	⬆️
utils/merkletrie/index/node.go	93.93% <100%> (+0.39%)	⬆️
worktree_status.go	65.95% <60%> (-1.65%)	⬇️
plumbing/transport/ssh/common.go	0% <0%> (-56.15%)	⬇️
plumbing/transport/ssh/auth_method.go	33.33% <0%> (-24.77%)	⬇️

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