Update combo topic features topic to 19

[tishko0]

No description provided.

[mddragnev]

If you update the sample to use state instead of refs => update the snippets as well.
Also update the function singnatures in the first snippet.
Also, update everywhere that ref is used like this:

const options = {
    filterKey: 'country',
    caseSensitive: true
};

comboRef.current.filteringOptions = options;

becomes this:

const options = {
    filterKey: 'country',
    caseSensitive: true
};

<IgrCombo filteringOptions={options} />

[mddragnev]

Remove the module imports