### Description
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/451.
The Wormhole Scan UI needs to provide a link to the emitter address for each VAA.
This pull request adds a field containing decoded emitter addresses in the following endpoints:
* `GET /api/v1/transactions`: field `emitterNativeAddress`
* `GET /api/v1/vaas*`: field `emiterNativeAddr`
For Solana and Aptos, the transaction hash returned by `GET /api/v1/vaas` is incorrect (currently it's the value transmitted in the gossip network, which is not the real transaction hash).
This pull request replaces it with the real transaction hash.
### Summary
The output of `GET /api/v1/vaas` was not being correctly sorted. This pull request changes the behavior so that the output will be sorted by the `timestamp` field.
Additionally, duplicated code was removed in the VAA code that handles queries.
Also, there was an unused query parameter `sortBy` which was being exposed but not used. Hence it was removed.
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/233
### 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
Several endpoints related to VAAs and observations returned `null` when no results were found.
This commit changes the behavior to return `[]` instead, which is more ergonomic for users.
Endpoints affected:
- `GET /api/v1/observations/:chain`
- `GET /api/v1/observations/:chain/:emitter`
- `GET /api/v1/observations/:chain/:emitter/:sequence`
- `GET /api/v1/observations/:chain/:emitter/:sequence/:signer/:hash`
- `GET /api/v1/vaas/{chain_id}`
- `GET /api/v1/vaas/{chain_id}/{emitter}`
- `GET /api/v1/vaas/{chain_id}/{emitter}/{seq}`
### Summary
In some cases, the query parameters for a MongoDB aggregation pipeline were not being initialized.
This led to errors in `GET /api/v1/vaas/{chain}/{emitter}/{seq}`.
Other endpoints could also have been affected.
### Summary
* On all endpoints, fix the behavior of the `page` parameter (which was previously being ignored).
* On `GET /api/v1/vaas`, fix the behavior of the `sortBy` parameter (which wasn't working when `parsedPayload=true`).
* For all endpoints, validate the query parameters `page`, `pageNumber` and `sortOrder`.
* Return descriptive errors when pagination-related parameters happen to be invalid (`page`, `pageSize`, `sortOrder`).
* Validate guardian addresses in query params.
### Testing plan
All parameters involved were manually tested.
* add vaaId and txHash relation in vaaIdTxHash collection
* add txHash in vaas collection
* add txHash in response vaa and as filter in find vaas endpoints