Improve completions for inline record fields

[mediremi]

This change improves inline record completions by:

1. showing the inline record's type when completing constructor payloads
2. showing each field's type for field completion

Before	After

These changes were implemented by reusing the completion logic used for records.

Explanation

While we currently show completions for record fields by creating a Field field completion for each field...

rescript/analysis/src/CompletionBackEnd.ml

Lines 1720 to 1741 in 6e6fe0a

	fields
	|> List.filter (fun (field : field) ->
	List.mem field.fname.txt seenFields = false)
	|> List.map (fun (field : field) ->
	match (field.optional, mode) with
	| true, Pattern Destructuring ->
	create ("?" ^ field.fname.txt) ?deprecated:field.deprecated
	~docstring:
	[
	field.fname.txt
	^ " is an optional field, and needs to be destructured \
	using '?'.";
	]
	~kind:
	(Field (field, TypeUtils.extractedTypeToString extractedType))
	~env
	| _ ->
	create field.fname.txt ?deprecated:field.deprecated
	~kind:
	(Field (field, TypeUtils.extractedTypeToString extractedType))
	~env)
	|> filterItems ~prefix

... for inline records we only emit Label "Inline record":

rescript/analysis/src/CompletionBackEnd.ml

Lines 1763 to 1765 in 6e6fe0a

	|> List.map (fun (field : field) ->
	create field.fname.txt ~kind:(Label "Inline record")
	?deprecated:field.deprecated ~env)

In commit 1b0296c, I copied the completion logic for records over to the inline records handler. I also added completion tests for inline records.

Then in commit 2758057, I extracted the common logic into a helper function called getRecordCompletions.

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commit: 328a3eb

[zth]

Fantastic, that's awesome! Nice work!