bugfix: stop-previous flag to remove wasm binary by index_id

[0xmovses]

Closes #786

Note that the changes to the plugin side were already merged to master, and then reverted. The changes to the plugin are on this branch, but the diff doesn't show because of the previous merge.

Changelog

• Adds conditional logic based on query param to remove_indexer.
• Adds remove_previous_indexer queries function.
• Adds metrics for new query function.

Testing

1. Build the new plugin binary cargo build -p forc-index -p fuel-indexer --release --features fuel-core-lib.
2. Refresh the DB and rebuild test binaries.
3. Start local fuel-node.
4. Start the indexer.
5. Deploy the block explorer ./target/release/forc-index deploy --path examples/block-explorer/explorer-indexer
6. Run the SQL query select * from index_asset_registry_manifest;
   • Make a mental note of the single wasm binary in the DB. 👀
7. Make some small change in the lib.rs of the block explorer.
8. Deploy the block explore with the new flag ./target/release/forc-index deploy --stop-previous --path examples/block-explorer/explorer-indexer
9. Run the same SQL query select * from index_asset_registry_manifest;

You should see that there is still only one wasm binary with the same index_id of 1. The old one was removed.

[ra0x3]

Left some feedback. Did not test. Will try that next time.

@rvmelkonian In the mean time, can we update the PR with manual testing steps for when its ready to be tested?