771 read traffic generator

[cody-littley]

Why are these changes needed?

The current traffic generation utilty writes blobs to eigenDA, but does not read them back. This PR augments the generator utility so that it is also capable of reading the blobs it has previously written.

Checks

• [x] I've made sure the lint is passing in this PR.
• [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • [x] Unit tests
  • [ ] Integration tests
  • [ ] This PR is not tested :(

[cody-littley]

Note to the reviewers: if you wish to test this locally, the following dashboard shows all of the new metrics generated by the traffic generator: link