feat(light-client-ext-helpers): tx-helper

[ryanleecode]

Adds a tx-helper package to light client extension helpers.

This replaces the "copy and paste" tx-helper inside of wallet template. This new package uses the copy and pasted tx-helper but exposes a different public API. Namely one that does not have a dependnecy on @polkadot-api/observable-client & @polkadot-api/substrate-client but simply @polkadot-api/json-rpc-provider. In addition, it assumes you always want to sign the transaction at the latest best block.

This package makes integration for light client extensions easier since they only need to have a json rpc provider and a polkadot signer to sign a transaction.

Once this is merged, I will try using it in this PR to polkadot js extension and update the usage docs accordingly.

[changeset-bot]

🦋 Changeset detected

Latest commit: b56ddd8

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

This PR includes changesets to release 5 packages

Name	Type
@substrate/light-client-extension-helpers	Minor
@substrate/wallet-template	Patch
@substrate/smoldot-discovery	Major
@substrate/extension	Patch
@substrate/connect	Patch

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