update CI4 to 4.6.0 + use codeigniter-vite and vite-plugin-codeigniter to load assets

closes #553

+ update php dependencies to latest

This removes computing latency when retrieving episodes list with download count in admin.
The more
analytics records, the more it took to calculate the sum of hits to get the downloads count for each
episode.

- fix defaultValue being empty string when cast as array
- fix initial styles for select to reduce
content layout shift

use starlight-openapi plugin to generate docs

closes #536

refactor(plugins): create Field objects per field type in settings forms + handle rendering in class

update manifest.schema.json to have defaultValue type differ based on field type

add PermalinkEditor component

update php and js packages to latest

- update docs
- render hint and helper options for all fields
- replace option's hint with
description

escape plugin description + replace codeigniter-icons with php-icons v1.2

add hint to select options + update dependencies to latest

fixes #511

feat(plugins): add methods to easily retrieve general, podcast and episode settings in hooks methods

feat(plugins): register plugins using Plugin.php file instead of namespace + simplify i18n structure