feat: add OracleSet and OracleDelete transactions

[pdp2121]

High Level Overview of Change

Title said it all.

Context of Change

PriceOracle amendment: https://github.com/XRPLF/XRPL-Standards/discussions/129

Type of Change

• [x] New feature (non-breaking change which adds functionality)

Before / After

OracleSet transaction page:

OracleDelete transaction page:

Table Detail view: