eth-json-rpc-provider: Remove deprecated methods `send` and `sendAsync`

We should remove the deprecated `send` and `sendAsync` methods from the `InternalProvider`. The reason they're still around is to maintain compatibility between the `InternalProvider` and libraries like `eth-query` / `ethjs-query`. Consequently, we need to audit our dependencies that consume the `InternalProvider` for use of `send` and `sendAsync`, remove the usage from our forks of said dependencies, replace any third-party dependencies that can't be fixed, and then finally remove the methods, leaving only `InternalProvider.request()` (as is expected by e.g. `ethers`).

Start by auditing dependencies that consume InternalProvider, especially eth-query and ethjs-query, for use of send and sendAsync. Review the project’s forks and any third-party dependencies that cannot be fixed. Done means those usages are removed or replaced and InternalProvider exposes only request().

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