chore: remove all internal uses of legacy params

[johnnylarner]

Description

Removed all legacy param references. Legacy files contain key values as bytes that were referenced. I moved these into the params file.

These changes only affect how we internally build our simapps. The NewKeeper remains unchanged and therefore I do not see the need to include this in the CHANGELOG. We may want to classify as a chore in that case.

closes: #XXXX

---

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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Include changelog entry when appropriate (e.g. chores should be omitted from changelog).
• Wrote unit and integration tests if relevant.
• Updated documentation (docs/) if anything is changed.
• Added godoc comments if relevant.
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[linear]

IBCGO-2352 Remove all remaining legacy params code

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 56.97%. Comparing base (da79ea8) to head (f590625).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
modules/apps/callbacks/testing/simapp/app.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8493      +/-   ##
==========================================
+ Coverage   56.80%   56.97%   +0.17%     
==========================================
  Files         296      291       -5     
  Lines       21431    21336      -95     
==========================================
- Hits        12174    12157      -17     
+ Misses       8707     8629      -78     
  Partials      550      550              

Flag	Coverage Δ
08-wasm	66.13% <ø> (ø)
e2e	1.18% <ø> (ø)
ibc-go	62.45% <0.00%> (+0.22%)	⬆️

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[gjermundgaraba]

I noticed that the genesis e2e test was failing, and when I started looking a bit deeper, I realized we could actually safely remove x/params entirely from our simapps.
The usage of the subspaces in the SDK modules were only for migration purposes, and we don't need that for our simapps.
Commit for this: 4179957

The only place that I've left any usage of params left is in our e2e tests, and that is only because it is needed for compatibility tests (where we spin up older versions). We will eventually be able to get rid of those too, but we need to at a minimum get rid of ibc-go v7 first (which might take some time still).

Edit: Sorry, I didn't mean to take over this PR, but I really wanted to get this merged, so I took the liberty of fixing one more thing I had missed in my initial review, which was that the param keys should be in the keys.go files rather than in the params.go file.
You can see the commit here: d964eef

[gjermundgaraba]

Great work! 🙌 This cleans up the codebase in a very real way 🎉

I left a comment on some updates I did to the PR, sorry for taking over a bit here at the end, I just wanted to get this merged in to test with some other changes :)