Update data::Row to contain columns

[panarch]

Prior steps - Make data::Row struct only work in execution layer, don't expose to user via neither Payload or Store traits.

• Change Payload::Select rows to use Vec<Value>
• Replace data::Row to Vec<Value> in Store traits

Main

• Put columns into Row struct
• Remove columns from FilterContext, BlendContext
• Remove redandunt columns field uses

[coveralls]

Pull Request Test Coverage Report for Build 3590202073

• 322 of 328 (98.17%) changed or added relevant lines in 18 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.05%) to 98.587%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/executor/join.rs	16	17	94.12%
core/src/executor/context/blend_context.rs	6	8	75.0%
core/src/executor/alter/table.rs	6	9	66.67%

Files with Coverage Reduction	New Missed Lines	%
core/src/result.rs	1	69.05%
core/src/executor/evaluate/mod.rs	1	97.43%
core/src/executor/execute.rs	1	94.86%

Totals
Change from base Build 3553834012:	0.05%
Covered Lines:	36902
Relevant Lines:	37431

---

💛 - Coveralls

[ever0de]

There are a few minor comments.
I'll see a bit more later(again today) to understand.

[ever0de]

Suggested change

	pub async fn fetch_labels<'a>(
	storage: &dyn GStore,
	relation: &'a TableFactor,
	joins: &'a [Join],
	projection: &'a [SelectItem],
	) -> Result<Vec<String>> {
	pub async fn fetch_labels (
	storage: &dyn GStore,
	relation: &TableFactor,
	joins: &[Join],
	projection: &[SelectItem],
	) -> Result<Vec<String>> {

Lifetime sharing here doesn't seem necessary.

[ever0de]

We are laying a great foundation

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