chore!: Reserve enum and match keywords

[jfecher]

Description

Problem*

Summary*

Reserves "enum" and "match" as keywords to avoid breaking code post-1.0. These keywords are eventually planned to be used in implementing enumerations in Noir.

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]

Compilation Report

Program	Compilation Time	%
sha256_regression	1.056s	4%
regression_4709	0.793s	1%
ram_blowup_regression	15.140s	2%
rollup-root	3.680s	1%
rollup-block-merge	3.540s	-13%
rollup-base-public	29.900s	1%
rollup-base-private	11.800s	8%
private-kernel-tail	1.052s	9%
private-kernel-reset	8.780s	1%
private-kernel-inner	2.018s	-1%

[github-actions]

Execution Report

Program	Execution Time	%
sha256_regression	0.056s	3%
regression_4709	0.001s	0%
ram_blowup_regression	0.582s	0%
rollup-root	0.106s	0%
rollup-block-merge	0.106s	0%
rollup-base-public	1.320s	-1%
rollup-base-private	0.523s	1%
private-kernel-tail	0.022s	0%
private-kernel-reset	0.384s	0%
private-kernel-inner	0.097s	1%

[github-actions]

Execution Memory Report

Program	Peak Memory
keccak256	74.65M
workspace	123.56M
regression_4709	315.98M
ram_blowup_regression	512.41M
rollup-base-public	492.17M
rollup-base-private	332.25M
private-kernel-tail	181.08M
private-kernel-reset	254.94M
private-kernel-inner	212.77M

[github-actions]

Compilation Memory Report

Program	Peak Memory
keccak256	78.55M
workspace	123.42M
regression_4709	422.96M
ram_blowup_regression	1.58G
rollup-base-public	2.55G
rollup-base-private	1.24G
private-kernel-tail	200.40M
private-kernel-reset	728.14M
private-kernel-inner	290.48M