cleanup and docs update, string types descriptive

[tabaktoni]

Fix #742
Fix #724

Motivation and Resolution

• Secure cairoVersion from non-ts unintentional number usage
• Removed unused constants that are now part of ec.

export const FIELD_PRIME = '800000000000011000000000000000000000000000000000000000000000001';
export const FIELD_GEN = '3';
export const FIELD_SIZE = 251;
export const EC_ORDER = '800000000000010FFFFFFFFFFFFFFFFB781126DCAE7B2321E66A241ADC64D2F';
export const ALPHA = '1';
export const BETA = '6F21413EFBE40DE150E596D72F7A8C5609AD26C15C915C1F4CDFCB99CEE9E89';
export const MAX_ECDSA_VAL = '800000000000000000000000000000000000000000000000000000000000000';
export const CONSTANT_POINTS = [...]

• Document utils methods
• add string type to documentation
• cleanup

Checklist:

• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Linked the issues which this PR resolves
• Documented the changes in code (API docs will be generated automatically)
• Updated the tests
• All tests are passing

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[penovicp]

Noticed that some of the JSDOC/TSDOC comment elements clash with the autogenerated content. I'll open a PR targeting this branch with the corresponding tweaks.

[ivpavici]

Suggested change

	* return hex string (ex."0x7572692f706963742f7433382e6a7067")
	* return hex string (ex. "0x7572692f706963742f7433382e6a7067")

[ivpavici]

Suggested change

	* return string (ex."uri/pict/t38.jpg")
	* return string (ex. "uri/pict/t38.jpg")

[github-actions]

🎉 This PR is included in version 5.19.6 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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