## Issue being fixed or feature implemented
For platform needs `getrawtransactionmulti` will help to reduce amount
of rpc calls for sake of performance improvement.
## What was done?
Implemented new RPC, basic functional test, release note.
## How Has This Been Tested?
On testnet:
```
> getrawtransactionmulti '{"000000abbe61a4d9b9356cb1d7deb1132d0b444a62869e71c2f3aa8ce2361359":["6e3ef19a3f955ac75a1f84dae60d42bbe11548ef54e37033ff2d91b3c4a09e9c", "415d5fafd5ee24ada8b99c36df339785a3066170c0dca6bb1aa6a5b96cf51e35"], "0":["ec7090f01c0e9b6e29d3be8810b12c780d2fb34372a53b231ce18bb7d2f1e8b0"]}'
> getrawtransactionmulti '{"000000abbe61a4d9b9356cb1d7deb1132d0b444a62869e71c2f3aa8ce2361359":["6e3ef19a3f955ac75a1f84dae60d42bbe11548ef54e37033ff2d91b3c4a09e9c", "415d5fafd5ee24ada8b99c36df339785a3066170c0dca6bb1aa6a5b96cf51e35"], "0":["ec7090f01c0e9b6e29d3be8810b12c780d2fb34372a53b231ce18bb7d2f1e8b0"]}' true
```
## Breaking Changes
N/A
## Checklist:
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have added or updated relevant unit/integration/functional/e2e
tests
- [x] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone
---------
Co-authored-by: pasta <pasta@dashboost.org>
