go/keymanager/churp: Allow nodes to apply for a new committee

[peternose]

No description provided.

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-core canceled.

Name	Link
🔨 Latest commit	2a1baa1
🔍 Latest deploy log	https://app.netlify.com/sites/oasisprotocol-oasis-core/deploys/65d9dd2084952e00084b215a

[codecov]

Codecov Report

Attention: Patch coverage is 22.59036% with 257 lines in your changes are missing coverage. Please review.

Project coverage is 65.61%. Comparing base (2f7008a) to head (3993810).
Report is 1 commits behind head on master.

❗ Current head 3993810 differs from pull request most recent head 2a1baa1. Consider uploading reports for the commit 2a1baa1 to get more accurate results

Files	Patch %	Lines
go/keymanager/churp/grpc.go	4.39%	87 Missing ⚠️
...bft/apps/keymanager/churp/state/interop/interop.go	0.00%	63 Missing ⚠️
go/consensus/cometbft/keymanager/churp/client.go	17.85%	43 Missing and 3 partials ⚠️
go/consensus/cometbft/apps/keymanager/churp/txs.go	59.01%	14 Missing and 11 partials ⚠️
.../consensus/cometbft/apps/keymanager/churp/query.go	0.00%	8 Missing ⚠️
go/consensus/cometbft/apps/keymanager/churp/ext.go	0.00%	5 Missing ⚠️
go/consensus/cometbft/apps/keymanager/query.go	63.63%	3 Missing and 1 partial ⚠️
...nsensus/cometbft/apps/keymanager/secrets/status.go	20.00%	1 Missing and 3 partials ⚠️
go/consensus/cometbft/keymanager/keymanager.go	55.55%	2 Missing and 2 partials ⚠️
.../cometbft/apps/keymanager/state/interop/interop.go	0.00%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5568      +/-   ##
==========================================
- Coverage   65.98%   65.61%   -0.37%     
==========================================
  Files         571      576       +5     
  Lines       58307    58613     +306     
==========================================
- Hits        38474    38461      -13     
- Misses      15362    15646     +284     
- Partials     4471     4506      +35     

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