feat: align on-chain valset with genesis.json valset

[zivkovicmilos]

Description

Depends on #2130

This PR introduces an alignment between the genesis.json validator set (lives on-disk), and the on-chain validator set in the genesis transactions.

How it works:

• Regardless of what valset management protocol we choose (PoC / PoS / PoA), the initial chain state will always be aligned with whatever is in the genesis.json valset
• The protocol to use is a configuration param (config.toml), and it's none by default (current behavior). The reasoning behind keeping it in the node's config.toml is to ensure this value is accessible from different stages of the chain pipeline (from genesis.json generation -> EndBlocker)
• If the user wants to use Proof of Contribution, they need to predeploy the r/sys/vals Realm (the deployment transaction must be present in the genesis.json) before starting their chain
• Whenever the user adds or removes a new validator from the genesis.json, the r/sys/vals Realm deployment transaction is updated to reflect the current state in the genesis.json
  • Only the init (constructor) part of the r/sys/vals Realm is updated, to reflect the changes. We use Go's templates for this purpose as it's a simple paste

cc @gfanton @moul

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.71%. Comparing base (10a6f7e) to head (41cbb2e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2465   +/-   ##
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  Coverage   54.71%   54.71%           
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  Files         583      583           
  Lines       78499    78499           
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+ Hits        42947    42953    +6     
+ Misses      32344    32340    -4     
+ Partials     3208     3206    -2     

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contribs/gnodev	23.81% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (ø)
contribs/gnokeykc	0.00% <ø> (ø)
contribs/gnomd	0.00% <ø> (ø)
gnovm	59.98% <ø> (ø)
tm2	54.44% <100.00%> (+0.01%)	⬆️

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