Add snapshot processing for all astrid modes

[mh0lt]

This PR allows stand alone astrid to participate in snapshot production.

It includes the following changes:

• All bor data storage is handled in the bor/heimdall stage
• Stores now process db & snapshot calls
• Snapshot production runs from multiple databases in stand alone mode
• In the legacy stages and astrid stage mode the chain db is still used

The current state of the types which manage bor persistence are as follows:

These changes have been tested by running amoy from scratch in various modes:

• no polygon sync
• polygon.sync
• polygon.sync.stage

I have also tested removing chaindata (& heimdall & polygon-bridge) dbs and restarting as well as removing locally produced snapshot files.

In all cases for my testing amoy startes, syncs and runs at the tip.

[taratorio]

@mh0lt this is great effort! There are 2 main areas to discuss:

1. Seems like the pruning flow is missing glue to tie it with the Heimdall and Bridge DBs for when running in standalone mode
   • https://github.com/erigontech/erigon/pull/12339#discussion_r1806733045
   • https://github.com/erigontech/erigon/pull/12339#discussion_r1806736390
2. Is it possible to have the "Ready" functionality go via ExecutionEngine instead so that we don't have to deal with the BlockReader logic in polygon/sync/execution_client.go?
   • https://github.com/erigontech/erigon/pull/12339#discussion_r1806688809
   • https://github.com/erigontech/erigon/pull/12339#discussion_r1806691865
   • https://github.com/erigontech/erigon/pull/12339#discussion_r1806692919

The other comments are correctness and cleanup related things that ive noticed.