### Description
This pull request implements an improvement in the processing logic of the `tx-tracker` service to avoid processing a message more than once.
### Description
This pull request implements improvements in the `tx-tracker` service:
* Adjust SQS visibilityTimeout.
* Process PythNet messages concurrently (this will make it easier for the service to catch up if there are a lot of messages in the input queue).
* Add more context information to error messages.
### Summary
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/404
The WormholeScan UI needs to display the sender address for each token bridge VAA. This pull request modifies the `tx-tracker` service to obtain that information for Solana and eight EVM chains.
The transaction sender will become accessible through the following endpoints:
* `GET /api/v1/global-tx/{chain}/{emitter}/{seq}`: field `originTx.from`.
* `GET /api/v1/transactions`: field `originAddress`.
In both cases, the field is nullable (i.e.: sometimes it may not be available due to eventual consistency or internal errors)
### Summary
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/254
For all chains except Solana, the data in `globalTransactions.sourceTx` was somewhat duplicated, since we already had that data in the `vaas` collection.
This pull request changes the `tx-tracker` service so that no redundant data will be written, and also changes the API to look up the data from the `vaas` collection instead.
The responses from the endpoint `/api/v1/global-tx` will no longer contain the field `originTx.from`.
### Summary
This pull request adds the functionality to search for VAAs using Solana tx hashes, e.g.:
`GET /api/v1/vaas?txHash=2qnNNBQQQ152sGkQ1Rnq2Kdr48LvdN4oXwnTWyEmJqYYWFusLWxbwhpGS5KTXH1bKKx9gg9BLZMKd3g1cXiy7QMz`.
Also, the VAA objects returned by the API now have a new field `nativeTxHash`, which contains the tx hash that generated the VAA in the native format of the emitter chain.
Tracking issues: https://github.com/wormhole-foundation/wormhole-explorer/issues/212, https://github.com/wormhole-foundation/wormhole-explorer/issues/214
### Testing guidelines
Endpoints affected:
* `GET /api/v1/vaas` now supports Solana tx hashes by using the `?txHash=` query parameter. This search is limited to VAAs created by the portal token bridge.
* Some VAAs returned by the API should have a new field `nativeTxHash`. All VAAs related to the portal token bridge should have this field set.
* An internal refactoring affected pretty much all routes under `GET /api/v1/vaas*`, which should be re-tested.
* In the response of `/api/v1/global-tx/`, the field `originTx.signer` has been renamed to `originTx.from`
### Summary
The tx-tracker service was exceeding node RPC rate limits, which caused it to fail.
This pull request changes the APIs upon which the service depends to avoid the same issue in the future.
Also, the backfiller job has been updated accordingly.
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/205
agodnic