Add Example Tests (#326)

* Initial tests

* Add more tests

* Clean tests

* Add invalid transfer test

* Fix test fmt
15 jobs for master in 6 minutes and 39 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Check
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check-std

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check-wasm

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  Workspace
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build-std

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passed #432326
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build-wasm

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passed #432328
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clippy-std

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passed #432329
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clippy-wasm

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passed #432330
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fmt

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passed #432327
linux-docker
test

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  Examples
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examples-clippy-std

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examples-clippy-wasm

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passed #432335
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examples-contract-build

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passed #432332
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examples-fmt

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passed #432336
linux-docker
examples-generate-metadata

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passed #432331
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examples-test

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  Publish
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linux-docker
publish-docs

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