Update node-api parts

[haerdib]

We should check the following files are still up to date:

• https://github.com/scs/substrate-api-client/tree/master/node-api/src/events
• https://github.com/scs/substrate-api-client/tree/master/node-api/src/metadata
• https://github.com/scs/substrate-api-client/tree/master/node-api/src/error

Follow up issue of #687

[haerdib]

• Events have been updated to the newest state in Add Encode Decode to ExtrsinicReport and use RawExtrinsicDetails #704. There have been no major changes.

• check metadata. There are quite some differences as subxt now uses the fully self-defined metadata, while we are doing something in between using self-defined and directly from frame-metadata. I personally believe that using fully self-defined metadata is a no-go for us, as it would enforce instant updates once the metadata is updated. Lets keep it small and simple for now.

• check error: There's been an update on side of parity. This needs to be adapted. Subxt has also updated the ModuleError to contain metadata. I don't think we should follow this update, as I'd rather keep the Errors small.