feat: add DB config dateFormat to provide default date/time formats

[kenjis]

Description
See #7177

• add DB config dateFormat

We should have this config value in the Connection class. Because each connection has the datetime format.

The current DB related class layers:

Entity
Model
Builder
Connection

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

I think this is the right way for the config, but it still leaves a big question about implementation. Were you planning that as a separate PR?

[ddevsr]

I hope this feature can be used by .env for multiple connection

[kenjis]

Some people want to use .env too much.
It is only for Config items that may change in different environments.
For example, if you build a development environment, the database host/username/password would be different from these in the production environment.
But why do you need to change the datatime format?

[kenjis]

@MGatner Yes, I'm going to use these values in Model and DataConverter (DataCaster) #8243.

[MGatner]

I'm good with this but there were a lot of differing opinions on the original thread - maybe see if @michalsn and @lonnieezell have thoughts.

[github-actions]

👋 Hi, @kenjis!

We detected conflicts in your PR against the base branch 🙊
You may want to sync 🔄 your branch with upstream!

Ref: Syncing Your Branch

[kenjis]

@MGatner Yes, I'm going to use these values in Model and DataConverter (DataCaster) #8243.

#8538 and #8243. Both are ready to merge.