Add sign method

[justkawal]

Note: (Have to add publish_to: None until we publish newest version of polkadart_keyring.)

Have to provide SignatureType to encode() method.

Now possible to do:

 final extrinsic = Extrinsic(
    signer: publicKey,
    method: encodedCall,
    signature: hexSignature,
    eraPeriod: 64,
    blockNumber: blockNumber,
    nonce: 0,
    tip: 0,
  ).encode(api.registry, SignatureType.sr25519).sign(keyPair);

or

 final extrinsic = Extrinsic(
    signer: publicKey,
    method: encodedCall,
    signature: hexSignature,
    eraPeriod: 64,
    blockNumber: blockNumber,
    nonce: 0,
    tip: 0,
  ).encodeAndSign(api.registry, SignatureType.sr25519, keyPair);

[codecov[bot]]

Codecov Report

Attention: 47 lines in your changes are missing coverage. Please review.

Comparison is base (b3c1e4e) 47.06% compared to head (4cba90f) 46.99%.

Additional details and impacted files

[](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) ```diff @@ Coverage Diff @@ ## justkawal/schnorrkel #386 +/- ## ======================================================== - Coverage 47.06% 46.99% -0.07% ======================================================== Files 162 164 +2 Lines 8899 8911 +12 ======================================================== Hits 4188 4188 - Misses 4711 4723 +12 ``` | [Flag](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | Coverage Δ | | |---|---|---| | [polkadart](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `17.01% <0.00%> (-0.17%)` | :arrow_down: | | [polkadart_cli](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `12.06% <ø> (ø)` | | | [polkadart_keyring](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `77.24% <ø> (ø)` | | | [polkadart_scale_codec](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `54.93% <ø> (ø)` | | | [sr25519](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `85.91% <ø> (ø)` | | | [ss58](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `96.87% <ø> (ø)` | | | [substrate_bip39](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `63.35% <ø> (ø)` | | | [substrate_metadata](https://app.codecov.io/gh/leonardocustodio/polkadart/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Leonardo+Custodio) | `87.61% <ø> (ø)` | | Flags with carried forward coverage won't be shown. 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[justkawal]

@leonardocustodio

[leonardocustodio]

A i'm merging without reviewing as the code is going to appear again in the other pr, that would just "duplicate" the review. We can see everything just a single time in there.