chore(gatsby): migrate static-query-components reducer to TypeScript

[hiwelo]

Description

This commit migrates the static-query-components reducer to TypeScript with few adjustments to the existing IGatsbyState interface.

The main adjustment is the update of the type of the key used for the map storing each static query from number to string.
This change reflect the fact that the key is described as being the id field of the interface, and this field is described as a string in the object definition.

Related Issues

Relates to #21995

[blainekasten]

This looks great to me, let's merge it!

Thank you so much for contributing to our TypeScript refactor! We have more work to do and we would love to have you stay involved in our transition. Please submit more PRs! 💜

[gatsbot]

Holy buckets, @hiwelo — we just merged your PR to Gatsby! 💪💜

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