fix: limit the maximum number of data rows fetched at once, other parameter checks

[martakam]

The purpose of this PR is to check the user-provided parameters to the GraphQL queries, so we do not return unexpected results, or too many rows of data at once.

Specifically:

• The limit parameter is capped at 100 rows of data at once
• We no longer allow null values for the parameters fuzzy, offset, sortBy, sortDirection and other that do not make sense if they're set to null explicitly
• The maximum number of genres the user can search for is now limited to 15
• We do not allow searching for very long book titles (over 200 characters)

Because of these backend changes, the following has changed on the frontend:

• The genre selector is limited to 15 genres, and an error toast is shown when the limit is reached
• The search input field is limited to 200 characters, and an error toast is shown here too when needed

Feel free to test these features when checking the PR.

This branch should be merged after #115, since it builds upon that PR.

Closes #113

[hestro]

Nice! This worked as expected for me

The merge-base changed after approval.

[johahor]

Same, works well. Merging.

The merge-base changed after approval.

[johahor]

For some reason i can't merge even after approval.. Can somebody else try? @martakam @hestro

[hestro]

For some reason i can't merge even after approval.. Can somebody else try? @martakam @hestro

Merging is blocked for me as well.....

The merge-base changed after approval.

[martakam]

Merged main into here now, so it should be good, but let's wait for CI first.
(I did not "dismiss" the reviews, that happens automatically)