docs: add documentation about depinject and app wiring

[julienrbrt]

Description

Closes: #12633

app (building-apps/...)

• explain about app wiring, concepts, use case, etc.. (linking to ADR)
• explain how to configure app.go (short explanation of the changes, linking to tutorials otherwise)
• explain how to configure app_config.go and as alternative app.yaml

modules (building-modules/depinject)

• explain how to create module.proto
• explain what to add in module.go

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #13683 (85c2be6) into main (6ae5641) will decrease coverage by 1.84%.
The diff coverage is 0.00%.

❗ Current head 85c2be6 differs from pull request most recent head 6993169. Consider uploading reports for the commit 6993169 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13683      +/-   ##
==========================================
- Coverage   56.66%   54.81%   -1.85%     
==========================================
  Files         636      647      +11     
  Lines       54552    55798    +1246     
==========================================
- Hits        30911    30588     -323     
- Misses      21134    22722    +1588     
+ Partials     2507     2488      -19     

Impacted Files	Coverage Δ
x/group/module/module.go	52.50% <0.00%> (ø)
x/distribution/client/cli/query.go	0.00% <0.00%> (-73.95%)	⬇️
x/distribution/client/cli/tx.go	5.49% <0.00%> (-69.79%)	⬇️
x/gov/client/cli/tx.go	13.94% <0.00%> (-56.58%)	⬇️
x/gov/client/cli/query.go	0.00% <0.00%> (-35.33%)	⬇️
x/distribution/simulation/operations.go	80.64% <0.00%> (-9.68%)	⬇️
x/gov/client/cli/util.go	86.15% <0.00%> (-9.24%)	⬇️
x/bank/types/params.go	84.48% <0.00%> (-7.41%)	⬇️
x/evidence/client/cli/query.go	76.19% <0.00%> (-3.12%)	⬇️
x/auth/module.go	54.05% <0.00%> (-3.09%)	⬇️
... and 54 more

[samricotta]

lgtm, just need to rebase. Might need another set of eyes that have more context to complete the approval process

[kocubinski]

Looks awesome, thank you for making these doc updates! Just some minor nits.