fix: bigint builtins are foreigns

[guipublic]

Description

Problem*

Resolves #6594

Summary*

I just changed the attribute, foreign and builtin are handled almost identically.

Additional Context

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

Peak Memory Sample

Program	Peak Memory
keccak256	78.48M
workspace	123.33M
regression_4709	422.91M
ram_blowup_regression	1.58G
private-kernel-tail	201.61M
private-kernel-reset	716.87M
private-kernel-inner	291.68M
parity-root	171.93M

[github-actions]

Execution Sample

Program	Execution Time	%
sha256_regression	0.623s	1%
regression_4709	0.393s	3%
ram_blowup_regression	4.316s	-3%
rollup-base-public	20.797s	-2%
rollup-base-private	18.517s	-5%
private-kernel-tail	0.683s	-3%
private-kernel-reset	1.454s	-2%
private-kernel-inner	0.982s	-1%
parity-root	0.529s	-1%

[github-actions]

Compilation Sample

Program	Compilation Time	%
sha256_regression	1.347s	2%
regression_4709	0.785s	1%
ram_blowup_regression	15.364s	0%
rollup-base-public	114.197s	2%
rollup-base-private	94.052s	-5%
private-kernel-tail	1.014s	-2%
private-kernel-reset	7.132s	-3%
private-kernel-inner	2.198s	1%
parity-root	0.730s	-8%
noir-contracts	88.317s	3%

[TomAFrench]

We needed to take on some tech debt with this fallback handler here:

noir/compiler/noirc_frontend/src/hir/comptime/interpreter/builtin.rs

Lines 239 to 241 in b23e85b

	blackbox if BlackBoxFunc::is_valid_black_box_func_name(blackbox) => {
	self.call_foreign(blackbox, arguments, return_type, location)
	}

We should remove this in this PR to make sure that we've got all of the instances of this issue.

[guipublic]

We should remove this in this PR to make sure that we've got all of the instances of this issue.

Done

[guipublic]

I dont't understand why CI is failing on some boundedvev doc that is not modified here, but anyways I fixed the typo in the doc.

[TomAFrench]

I dont't understand why CI is failing on some boundedvev doc that is not modified here, but anyways I fixed the typo in the doc.

Thanks, I think this got affected by the release PR which got merged.

[github-actions]

🚀 Deployed on https://676997b424c64e8e35f22cf0--noir-docs.netlify.app

[github-actions]

FYI @noir-lang/developerrelations on Noir doc changes.