feat: Add Hash impls for EmbeddedCurvePoint and EmbeddedCurveScalar

[jfecher]

Description

Problem*

Replaces #6918

Summary*

Thanks to @skaunov for the original issue. This needed to be broken into a separate PR since I couldn't suggest these changes on the original.

Implements Hash for two types so that they can be put in HashMaps, etc.

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 Memory Report

Program	Peak Memory	%
keccak256	78.54M	0%
workspace	123.63M	0%
regression_4709	422.96M	0%
ram_blowup_regression	1.58G	0%
rollup-base-public	202.76M	100%
rollup-base-private	202.76M	100%
private-kernel-tail	168.30M	-17%
private-kernel-reset	168.33M	-77%
private-kernel-inner	168.30M	-43%

[github-actions]

Execution Memory Report

Program	Peak Memory	%
keccak256	74.68M	0%
workspace	123.88M	0%
regression_4709	315.98M	0%
ram_blowup_regression	512.50M	0%
rollup-base-public	202.76M	-74%
rollup-base-private	202.76M	-53%
private-kernel-tail	168.30M	-8%
private-kernel-reset	168.33M	-35%
private-kernel-inner	168.30M	-22%

[TomAFrench]

Seeing a lot of red here.

[jfecher]

@TomAFrench looks like those external repos have their own trait with a different Hash function. Now that these types implement std::hash::Hash, it is being resolved to that instead leading to the parameter count error. Those external libraries in aztec-packages will need to be updated.

We may need #6895 to be merged first and to update aztec-packages to only import the trait containing the no argument hash function.