feat: add base agent class

[TimoGlastra]

Adds a BaseAgent class that does most of the heavy lifting for the agent. Agent extends this and registers all dependencies in the registerDependencies method.

When adding the tenant module, I'll also extend the BaseAgent for the TenantAgent class. This allows the Agent class to do all setup that only needs to happen once for the base agent, and the tenant agent can expose the same api without doing this registration setup.

Relatively small PR, but a lot of changes due to dependency on #898 and #881

[codecov-commenter]

Codecov Report

Merging #919 (2d93e20) into main (6d88aa4) will increase coverage by 0.18%.
The diff coverage is 88.43%.

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
+ Coverage   87.70%   87.89%   +0.18%     
==========================================
  Files         475      481       +6     
  Lines       11339    11466     +127     
  Branches     1874     1910      +36     
==========================================
+ Hits         9945    10078     +133     
+ Misses       1327     1322       -5     
+ Partials       67       66       -1     

Impacted Files	Coverage Δ
packages/core/src/agent/AgentConfig.ts	90.16% <ø> (-0.47%)	⬇️
packages/core/src/agent/Events.ts	100.00% <ø> (ø)
packages/core/src/constants.ts	100.00% <ø> (ø)
...les/credentials/formats/CredentialFormatService.ts	100.00% <ø> (ø)
...cation/handlers/V1RevocationNotificationHandler.ts	71.42% <ø> (ø)
...cation/handlers/V2RevocationNotificationHandler.ts	71.42% <ø> (ø)
...ges/core/src/modules/credentials/services/index.ts	100.00% <ø> (ø)
...ore/src/modules/dids/methods/web/WebDidResolver.ts	60.00% <ø> (ø)
...c/modules/routing/handlers/MediationDenyHandler.ts	62.50% <0.00%> (+6.94%)	⬆️
packages/core/src/storage/migration/updates.ts	100.00% <ø> (ø)
... and 103 more

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[TimoGlastra]

Superseded by #921