fix: Expand DevMode flag to set values for external access

[lenny-goodell]

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/go-mod-bootstrap/blob/main/.github/Contributing.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) N/A
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) N/A

Testing Instructions

Run non-secure edgex stack
Build Device SImple (Go Device SDK) with this branch
run Device SImple in Dev Mode (./device-simple -cp -d -o)
Verify Simple-Device01 was added as a device to Core MetaData (via Edgex UI)
Send following command to Core Command

curl http://localhost:59882/api/v3/device/name/Simple-Device01/Switch

Verify 200 response and a new Event is returned.

New Dependency Instructions (If applicable)

[bnevis-i]

I don't get what this code does or why it works.

[codecov-commenter]

Codecov Report

Merging #601 (14c1edc) into main (5491853) will decrease coverage by 0.24%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main     #601      +/-   ##
==========================================
- Coverage   58.79%   58.56%   -0.24%     
==========================================
  Files          31       31              
  Lines        2524     2534      +10     
==========================================
  Hits         1484     1484              
- Misses        943      953      +10     
  Partials       97       97              

Files Changed	Coverage Δ
bootstrap/config/config.go	32.21% <0.00%> (-0.53%)	⬇️