Added support for multipart form data parsing

[djthorpe]

This pull request updates the Encoder logic in pkg/multipart/multipart.go to improve how slices and arrays are handled when encoding form fields. The main change ensures that slices and arrays are written as repeated form fields, except for []byte, which is treated as a single scalar value.

Improvements to form field encoding:

• Updated the writeField method to encode slices and arrays as repeated form fields, while handling []byte as a single value instead of splitting it, ensuring correct multipart form serialization.

[Copilot]

Pull request overview

This pull request adds support for encoding slices and arrays as repeated form fields in the multipart encoder, with special handling for []byte to treat it as a single scalar value rather than individual bytes.

Changes:

• Added logic in the writeField method to detect slices and arrays and encode them as repeated form fields
• Implemented special case handling for []byte to convert it to a string instead of individual byte values
• Used recursive calls to handle nested structures and properly accumulate errors

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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