change spark connection form and add spark connections docs

[shohamy7]

---

Related: #28790
This PR aims to add docs about each Spark connection in a separate page.
In addition, adding a more user-friendly connection form for Spark and Spark SQL connection

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[shohamy7]

@Taragolis
Please review, would like to here what you are think on this PR :)

[Taragolis]

Looks good. Just one small NIT from my side

[josh-fell]

@shohamy7 Have you tried to create a connection that isn't one of the connections being updated here? Behind the scenes with connections, all of the connection form data is submitted across all connection types. My concern is that adding the any_of validation might block other connections from being created in the UI because other forms don't have these exact fields.

[shohamy7]

@josh-fell
Good point!
I didn't know about this one. I've checked and saw that it is causing issues with other connections.
But I saw that when I add default values, the problem solved.
I saw that we already implement this kind of logic in the VaultHook.

airflow/airflow/providers/hashicorp/hooks/vault.py

Lines 380 to 386 in 71314b8

	"kv_engine_version": IntegerField(
	lazy_gettext("KV engine version"),
	validators=[any_of([1, 2])],
	widget=BS3TextFieldWidget(),
	description="Must be 1 or 2.",
	default=DEFAULT_KV_ENGINE_VERSION,
	),

I will push a fix with default values.

Issue addressed

[YvesMentens]

How should we pass the extra params that have been removed in this PR now?

[eladkal]

How should we pass the extra params that have been removed in this PR now?

It's not removed.
This is just friendlier UI form.

[YvesMentens]

But how do I pass the extra parameters then? If I cant add them in the UI?