fix(ui5-tokenizer, ui5-multi-input,ui5-multi-combobox): Improve stylisation

[niyap]

• Tokenizer max-width calculation is adjusted: the inner-input width is correct now, as well as the --_ui5-input-icons-count is set to the tokenizer element itself in addition to the host element. This ensures the variable is available in the tokenizer's shadow DOM context where the max-width calculation is performed. Previously, the variable was only set on the MultiInput host, but the tokenizer's max-width calculation could not access it, resulting in the icon count being 0 instead of the correct value.
• inner-input-with-icon attribute is always set when an icon is presented, no matter of its kind.
• last-visible-token attribute added in order to mark the last visible that does not overflow when N-more indicator is present
• inner-input width and paddings are adjusted according to the specification covering all the use cases (icon presented, tokenizer available or just an input field)

JIRA: BGSOFUIRILA-3333
FIXES: #5096
FIXES: #13184

[ui5-webcomponents-bot]

🧹 Preview deployment cleaned up: https://pr-13314--ui5-webcomponents.netlify.app

[ui5-webcomponents-bot]

🎉 This PR is included in version v2.21.0-rc.4 🎉

The release is available on v2.21.0-rc.4

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