Stop assuming that all transparent addresses are on mainnet

[teor2345]

Currently, From<Script> for Address assumes that all addresses are on mainnet.

But Zebra needs to support mainnet and testnet.

We should delete From<Script> for Address, and use the From<ScriptAndNetwork> for Address in PR #1170.

We should also check for any other places in Zebra where we've assumed Mainnet.

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Basically, given a script hash alone (as lock_script, the one we get from transaction outputs) it is not possible to know to which network it belongs, so i had to create a new type ScriptForNetwork and implement impl From<ScriptForNetwork> for Address to do the conversion.

Originally posted by @oxarbitrage in #1170 (comment)

[teor2345]

Blocked on #1170

Do we need to fix this bug in the first alpha release, or can it wait until later?

[dconnolly]

Blocked on #1170

Do we need to fix this bug in the first alpha release, or can it wait until later?

I think we can get away with not fixing this for the first alpha, but probably not any betas and certainly not the first major/stable release.

[teor2345]

It was easier than I thought, see #1191.