test: Make block-streamer unit-testable and add tests (#442)

This PR is a combination of refactoring + testing, the former enabling
the latter

## Mock `impl` instead of `trait`
Originally, `trait`s such as `S3ClientTrait` were used to abstract the
behaviour of I/O related `struct`s, allowing for the injection of mock
implementations via `automock`. This was fine, but lead to very verbose
syntax which needed to be propagated throughout the codebase where ever
it was used.

Now, the `impl` itself is mocked, and either the mock or real
implementation is returned dependant on the `cfg(test)` flag. This means
we no longer need to worry about generics and can instead use the
`struct` itself, as we would with non-mocked code.

The trade-off here is that rust now thinks the 'real' code is
dead/unused as `test` is enabled by default.

## Mocking `near-lake-framework`
`aws` exposes an HTTP client which can be configured with mock
request/response values. `aws-sdk-s3` can be configured to use this
client, creating a mock client. Injecting this config into
`near-lake-framework` allows us to create deterministic outputs,
enabling unit-testing.

`aws_config` is now taken as a parameter where relevant so that we can
mock `near-lake-framework` in out tests. The functions for achieving
this have been placed in `test_utils` so they can be reused.

## Test `BlockStreamerService` and `BlockStream`
With `RedisClient`, `S3Client`, and `Lake` now mockable - tests have
been added for these `struct`s. I've also added a Github action which
runs on every PR. All raw block data has been added to `data/`, which
makes up the majority of the diff in this PR.

.github/workflows/block-streamer-ci.yml

@@ -0,0 +1,73 @@
+name: Block Streamer
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - "block-streamer/**"
+  pull_request:
+    paths:
+      - "block-streamer/**"
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v2
+    - name: Check
+      working-directory: ./block-streamer
+      run: cargo check
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v2
+    - name: Test
+      working-directory: ./block-streamer
+      run: cargo test
+
+
+  format:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v2
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: 1.70.0
+        override: true
+        profile: minimal
+        components: rustfmt
+    - name: Check formatting
+      working-directory: ./block-streamer
+      run: |
+        cargo fmt -- --check
+
+  clippy:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v2
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: 1.70.0
+        override: true
+        profile: minimal
+        components: clippy
+    - name: Clippy check
+      working-directory: ./block-streamer
+      run: |
+        cargo clippy