API: Make the data endpoints public.

[winder]

Summary

We want the data endpoints to be available in the SDKs, so they are being marked "public". This means the regular API token will be able to use these endpoints when they are enabled. Node API providers, Relays and participation nodes would not have this enabled, so there should be no security concern.

Test Plan

N/A

[codecov]

Codecov Report

Merging #4900 (5a23249) into master (80476a7) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4900      +/-   ##
==========================================
- Coverage   54.05%   54.05%   -0.01%     
==========================================
  Files         427      427              
  Lines       53520    53520              
==========================================
- Hits        28930    28928       -2     
  Misses      22319    22319              
- Partials     2271     2273       +2     

Impacted Files	Coverage Δ
ledger/voters.go	68.65% <0.00%> (-4.48%)	⬇️
ledger/tracker.go	74.26% <0.00%> (-3.80%)	⬇️
ledger/acctonline.go	77.77% <0.00%> (-0.52%)	⬇️
network/wsNetwork.go	64.74% <0.00%> (-0.18%)	⬇️
ledger/testing/randomAccounts.go	56.61% <0.00%> (ø)
catchup/service.go	69.32% <0.00%> (+0.24%)	⬆️
network/wsPeer.go	69.68% <0.00%> (+0.71%)	⬆️
ledger/acctupdates.go	69.72% <0.00%> (+0.72%)	⬆️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️

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