feat: add form support and better routing; implement TODO app example #95

Job	Run time
Build & test (stable, ubuntu-latest)	2m 2s
Build & test (stable, macos-latest)	2m 2s
Build & test (stable, windows-latest)	3m 58s
Build & test (nightly, ubuntu-latest)	1m 56s
Build & test (nightly, macos-latest)	1m 43s
Build & test (nightly, windows-latest)	3m 48s
Machete dependencies checks	8s
Clippy lint checks	36s
Code formatting checks	26s
Test coverage checks	2m 27s
	19m 6s

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