feat: add isModalSubmitInteraction() type guard (#1428)

* Implement type-guard for modal submit interactions

Added a type-guard function to check for modal submit interactions.

* Implement missing isModalSubmitInteraction typeguard in deno types

Added a type-guard function to check for modal submit interactions in deno types because I missed that before.

* fix(typings): replace 'type-guard' with 'type guard'

This corrects the spacing in the term across multiple locations for consistency with standard TypeScript terminology.

* Revert "fix(typings): replace 'type-guard' with 'type guard'"

This reverts commit 822b2e0.

* fix(typings): replace 'type-guard' with 'type guard' in jsdoc comments in v10

* fix(typings): update JSDoc comments to use 'type guard' instead of 'type-guard'

* fix(typings): replace "type-guard" with "type guard" in v9 utils

* feat(interactions): add type guard for modal submit interactions in v9

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Co-authored-by: Luca Hentschel <[email protected]>

Author: The-LukeZ