Add `notFound` handler for unknown endpoints

[codacy-production[bot]]

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Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: +0.00%)	:white_check_mark: 100.00% (target: 100.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (1edab815583b9a138b52498910fc43f03765c80d) | 11645 | 11645 | 100.00% | | | Head commit (a5a3964b6824f6a565afe5842984ffb01ef468a5) | 11658 (+13) | 11658 (+13) | 100.00% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1548) | 14 | 14 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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