[Tooltip] Allow global configuration of position

[wbeeftink]

Please describe the feature you would like to request.

Allow global configuration of tooltip position.

What is the use-case or motivation for this proposal?

We use many tooltips in our application and it's tedious and prone to errors to have to define matTooltipPosition="above" in all instances.

Is there anything else we should know?

As far as I can tell, the MAT_TOOLTIP_DEFAULT_OPTIONS interface only allows setting delays and not the position.

From the source:

/** Default `matTooltip` options that can be overridden. */
export interface MatTooltipDefaultOptions {
    showDelay: number;
    hideDelay: number;
    touchendHideDelay: number;
}

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