Add more form attributes

[ElijahAhianyo]

This PR adds more form attributes to various HTML elements in cot

[codecov]

Codecov Report

❌ Patch coverage is 92.91339% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot/src/form/fields.rs	90.11%	5 Missing and 21 partials ⚠️
cot/src/form/fields/files.rs	93.75%	0 Missing and 1 partial ⚠️

Flag	Coverage Δ
rust	89.76% <92.91%> (+0.10%)	⬆️

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Files with missing lines	Coverage Δ
cot-core/src/html.rs	97.65% <100.00%> (+0.20%)	⬆️
cot/src/form/fields/attrs.rs	100.00% <100.00%> (+100.00%)	⬆️
cot/src/form/fields/files.rs	93.08% <93.75%> (-0.07%)	⬇️
cot/src/form/fields.rs	89.06% <90.11%> (+0.81%)	⬆️

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