Add engineering levels documentation

[allthedoll]

Description

This document outlines the engineering levels at FlowFuse, detailing expectations, core dimensions for evaluation, and promotion criteria for engineers.

Related Issue(s)

N/A

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

[allthedoll]

Check your names off when you've read this and left any comments, pls.

• @Steve-Mcl
• @hardillb
• @knolleary
• @n-lark
• @cstns
• @andypalmi
• @ppawlowski

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[knolleary]

LGTM

For the Performance/Reviews section, it isn't clear who is responsible for the evidence gathering and synthesis. Will engineers be asked to produce a document of some sort, or will it be a manager's task?

[cstns]

Same comment as @knolleary, looking good otherwise