add $ prefix to import and export namespaces when starting with integer

[dievardump]

This PR fixes #794 by prefixing with the character "$" namespaces, autogenerated in codegen / barrel files, starting with an integer and therefore invalid module names.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a3d3cdecc7650a26cf0fef868ad0c2e301cbbbf0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
typechain	Patch
@typechain/hardhat	Patch
@typechain/ethers-v5	Patch
@typechain/starknet	Patch
@typechain/truffle-v5	Patch
@typechain/web3-v1	Patch
test-e2e	Patch
example-truffle-v5	Patch

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