perf(log)!: LazyHash for producing txs and blocks debug hashes

[wesl-ee]

Closes #4167

Generalizes LazyBlockHash as LazyHash so now Txs and Blocks are hashed only on evaluation of the debug printf

#go-api-breaking

[melekes]

Thanks @wesl-ee ❤️

I think we can now remove fmt.Sprintf because it's HexBytes

[melekes]

libs/log/lazy.go:36:34: unexported-return: exported func NewLazyHash returns unexported type *log.lazyHash, which can be annoying to use (revive)
func NewLazyHash(inner hashable) *lazyHash {
                                 ^
test/e2e/tests/app_test.go:96:47: unnecessary conversion (unconvert)
		require.Equal(t, res.Hash, cmtbytes.HexBytes(hash))

[andynog]

Thanks @wesl-ee. Overall looks good to me. Could you please check @melekes suggestions ? Also, since this seems to be breaking change, could you also please add a changelog entry.

[cason]

Thank you for this, the solution looks very elegant.

Left some comments.

[andynog]

thanks for adding the changelog entry

[melekes]

👍