Added polkadot/api and rewrite sendTransaction

[quetool]

Installed and using "@polkadot/api" to sign and send transaction and verify that we can obtain a transaction hash.

Needs to be ran with some coins either on Polkadot mainnet or westend. I wasn't able to get them on any faucet.

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[ganchoradkov]

@quetool could you check please why it fails to build? pnpm build

[quetool]

@quetool could you check please why it fails to build? pnpm build

Maybe it's this? I don't know, I'm not expert here, better you checkout that branch and check cause I didn't introduce this.

I ran ppm build and it didn't fix

[quetool]

@ganchoradkov I really don't know why it fails