feat: nightfall3 bec optimizations

[VishnuNarayanan3]

What does this implement/fix? Explain your changes.

Change	Filepath(s)
Added a system to write keys to a backup file, and restore them on client bootup	nightfall-client/src/services/keys.mjs , nightfall-client/src/index.mjs
CHECK_REGISTER_PROPOSER_SECOND inherited from environment variables instead of hard-coding	apps/proposer/src/proposer.mjs
checkAndChangeProposer can now be skipped by controlling an environment variable	apps/proposer/src/proposer.mjs
checkAndRegisterProposer no longer crashes the container if the call to optimist fails	apps/proposer/src/proposer.mjs	Added try-catch to method
Proposer container now supports hot reloading in local	apps/proposer/package.jsondocker/docker-compose.apps.yml	Added nodemon
Improved logging on /offchain-transaction route	apps/proposer/src/proposer.mjs
Added configuration for amoy and baseSepolia	bin/config/default.js
Infosec compliance - Forces the transitive dependency request-cookie to a version without vulnerabilities	cli/package.jsoncommon-files/package.json	"request": { "tough-cookie": "4.1.3" }
Infosec compliance - Removed the super user used in images	docker/client.Dockerfiledocker/deployer.Dockerfile
Client, worker and optimist now support start up on arbitrary ports that can be controlled via environment variables. This is because the loss of super-user prevents startup on protected port 80.	worker/src/index.mjsnightfall-client/src/index.mjsnightfall-optimist/src/index.mjs
Optimist container no longer crashes when mempool transactions build up over time. This is done by throttling the number of txs fetched from db at any given time, the amount can be controlled using the variable MEMPOOL_TXS_FETCH_LIMIT	config/default.jsnightfall-optimist/src/services/block-assembler.mjsnightfall-optimist/src/services/database.mjs
Logging change - The repeated “heartbeat” message in the block assembler can now be toggled via a new endpoint - /debug/toggle-heartbeat-loggingbug/toggle-heartbeat-logging	nightfall-optimist/src/services/block-assembler.mjsnightfall-optimist/src/routes/debug.mjs	This was primarily to simplify log anaylsis by minimizing log cluttering
Client container no longer syncs from the firstSeenBlock, but uses the lastProcessedBlock. This avoids an unnecessary delay in the bootup time of the client.	nightfall-client/src/services/state-sync.mjs
Client container no longer returns a “Bad Request” while syncing. It returns a “503 - Nf3 client is syncing” message instead. The healthcheck route has also been excluded from this to prevent k8s from considering the container unhealthy.	nightfall-client/src/app.mjs

Does this close any currently open issues?

No

What commands can I run to test the change?

curl for new debugging endpoint:

curl --location --request POST 'http://{optimistUrl}/debug/toggle-heartbeat-logging' \
--header 'Content-Type: application/json' \
--data-raw '{
    "heartBeatLogging": "false"
}'

Any other comments?

PR includes multiple changes centred around "unhappy paths" such as mempool buildup, container crashes etc. Also includes configuration changes to attempt deployment on polygon amoy and base sepolia.