Update validators for dynamic root zcaps

[aljones15]

1. adds a new util for generating root zcaps dynamically
2. Updates tests to use new root zcap feature
3. Updates proofs for CreateWebLedgerRecords and UpdateWebLedgerRecord to expect new zcaps
4. Changes the validator for LedgerConfig to use CapabilityInvocation instead of AssertionPurpose
5. Adds zcap context to ledgerConfig validator
6. Updates assertions for some tests and also makes corrections to a few tests (such as using a ledger id)

NOTE: this pr does not contain the caveats such as /records or /config.

Tasks

• [x] Review code and see if any untested functionality needs to be changed
• [x] Test this branch in veres-one with did-bench-cli
• [x] Update did-bench-cli and veres-one-maintainer-cli to use newer zcap creation
• [x] Add issues for tests that are broken / skipped
• [x] Add issue for adding validation to ledgerWrite (not record write) proofs as we now have code similar to them
• [ ] Add CHANGELOG entry (this is probably a major release)
• [ ] Update peerDeps for major release

UNFINISHED DON'T MERGE This PR awaits this PR: https://github.com/veres-one/veres-one-validator/pull/42 Also please note this PR has typos in it corrected in https://github.com/veres-one/veres-one-validator/pull/42

TODO:

• [x] A way of determining the controller of the rootZcap must be determined
• [x] See this example in ezcap-express for an example
• [x] Use veres-one's test project to test this