Migrate from `eyre` to `anyhow` in `light-client` crate

[Ognyan Genev]

To keep consistency amongst our code base, we want to use the same error handling library which in our case is anyhow.

However, in the light-client crate we use the eyre library. It will be nice if we migrate from eyre to anyhow to keep consistency.

[Qiwei Yang]

I could try to take this

[Ognyan Genev]

I could try to take this

sure!