Load Testing for Intent Bridge

[rymcol]

Description

Adds load testing options for the intent bridge:

• Burst Mode (many transactions at once)
• Sustained Mode (known number of transactions over time at a constant rate)

Motivation and Context

Currently we can only manually test the bridge, this gives us the option to send sustained or fast load to the bridge to see how it performs

How Has This Been Tested?

This PR is for a method of testing, so it has been tested by running it manually

Types of changes (remove all unchecked types)

• New feature (non-breaking change which adds functionality)

Checklist:

• If my change requires a change to the documentation, I have updated the documentation accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additions or updates to any deployment scripts to ensure that the protocol is functional (Makefile, Dockerfile, Forge Script, etc.), I have made these changes, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additional test coverage, I have created those tests accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.

[kss-t1]

If that works (please test manually) , that's great. Approved.

There is a number of suggested improvements - apply these if you like.

In general it feels to me that this solution is a little overengineered. It could be much simpler, and still do its job!