Simplify Idno core and common namespaces

[benwerd]

Here's what I fixed or added:

• Idno\Common\Page::getInput: Refactored input retrieval logic to clarify precedence (request > JSON payload > default) and ensure filters are applied correctly, fixing a minor bug.
• Idno\Core\Idno::componentFactory: Simplified the factory method to reduce branching, consolidate class existence and subclass validation, and handle default class instantiation more consistently.
• Idno\Core\Config: Streamlined several boolean and string return helpers (getTitle, getDescription, isPublicSite, multipleSyndicationAccounts, isDefaultConfig) using null coalescing and direct boolean casts.
• Idno\Core\Service: Extracted URL normalization logic into a new private helper method normalizeUrlForToken and reused it in generateToken to deduplicate code.

Here's why I did it:

The primary goal was to simplify and clarify code within the Idno\Core and Idno\Common namespaces, as requested. This refactoring addresses areas of complexity, reduces redundant logic, improves readability, and fixes a minor bug in Page::getInput, making the codebase more maintainable and easier to understand.

Checklist: ([x] to check/tick the boxes)

• This pull request addresses a single issue
• If this code includes interface changes, I've included screenshots in this Pull Request thread
• I've adhered to Known's style guide (these codesniffer rules might help!)
• My git branch is named in a descriptive way - i.e., yourname-summary-of-issue
• I've tested my code in-browser
• My code contains descriptive comments
• I've added tests where applicable, and...
• I can run the unit tests successfully.

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