go/runtime: Switch to a unified bundle format

[Yawning]

• Define the file format
• Implement the file format
• Switch the providers to use the file format
• Write a tool to create files in the format
• Unbreak the e2e tests
  • Everything that isn't the runtime trust root test
  • The runtime trust root test

Test support was implemented in the worst possible way, in an attempt to minimize code changes by having the test harness dynamically generate the runtime bundles when provisioning the network. While it is possible to make the tests actually use pre-generated bundles, there are a handful of tests that create arbitrary runtimes as part of the test process, which will complicate matters.

Implements #4469

[codecov]

Codecov Report

Merging #4474 (284a79f) into master (6983322) will decrease coverage by 0.40%.
The diff coverage is 65.45%.

❗ Current head 284a79f differs from pull request most recent head 198d165. Consider uploading reports for the commit 198d165 to get more accurate results

@@            Coverage Diff             @@
##           master    #4474      +/-   ##
==========================================
- Coverage   69.01%   68.60%   -0.41%     
==========================================
  Files         424      425       +1     
  Lines       47365    47560     +195     
==========================================
- Hits        32688    32629      -59     
- Misses      10676    10884     +208     
- Partials     4001     4047      +46     

Impacted Files	Coverage Δ
go/runtime/host/sgx/sgx.go	71.07% <0.00%> (ø)
go/runtime/bundle/bundle.go	61.72% <61.72%> (ø)
go/runtime/registry/config.go	70.17% <73.46%> (+2.78%)	⬆️
go/runtime/host/mock/mock.go	92.38% <100.00%> (ø)
go/runtime/host/sandbox/sandbox.go	65.84% <100.00%> (-5.44%)	⬇️
go/runtime/registry/registry.go	74.03% <100.00%> (-0.71%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	0.00% <0.00%> (-52.78%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/consensus/tendermint/api/errors.go	86.66% <0.00%> (-13.34%)	⬇️
go/worker/common/committee/p2p.go	78.94% <0.00%> (-10.53%)	⬇️
... and 36 more

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