Refactoring of https connector to make root certificates optional (#47)

* Proposal for refactoring of https connector to make root certificates optional

* Tentative fix (#48)

Co-authored-by: Nicolas Savoire <nicolas.savoire@datadoghq.com>

* return error when HTTPs cannot be used but is requested

* Correctly handle error when no root certificates are found

* Use latest common multipart released package

* Cleanup implementation + add tests

* Fix linting errors

* enable matrix build and test on all expected platforms

* Rename MaybeHttpsConnector to Connector

* Fix compilation on Windows

* Make pin_project_lite usage compile on windows

* Impl own pin project

* Settle on using pin_project

Co-authored-by: r1viollet <74836499+r1viollet@users.noreply.github.com>
Co-authored-by: Nicolas Savoire <nicolas.savoire@datadoghq.com>

.github/actions/cache/action.yaml

@@ -1,5 +1,5 @@
-name: '[rust] Checkout and cache' 
-description: '[rust] Checkout cache'
+name: '[rust] Cache' 
+description: '[rust] Cache'
 
 runs:
   using: composite

.github/workflows/test.yml

@@ -5,8 +5,11 @@ env:
 
 jobs:
   test:
-    name: cargo test --workspace
-    runs-on: ubuntu-latest
+    name: "cargo test --workspace #${{ matrix.platform }}"
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      matrix:
+        platform: [windows-latest, ubuntu-latest, macos-latest] 
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2

ddprof-exporter/Cargo.toml

@@ -11,6 +11,7 @@ license = "Apache-2.0"
 crate-type = ["cdylib", "lib"]
 
 [dependencies]
+anyhow = "1.0"
 bytes = "1.0"
 chrono = "0.4"
 futures = "0.3"
@@ -19,16 +20,19 @@ lazy_static = "1.4"
 libc = "0.2"
 regex = "1.5"
 hyper = { version = "0.14", features = ["http1", "client", "tcp", "stream"], default-features = false }
-tokio = { version = "1.8", features = ["rt"]}
+tokio = { version = "1.8", features = ["rt", "macros"]}
+tokio-rustls = { version = "0.23" }
 percent-encoding = "2.1"
 futures-core = { version = "0.3.0", default-features = false }
 futures-util = { version = "0.3.0", default-features = false }
 mime_guess = { version = "2.0", default-features = false }
 http-body = "0.4"
-pin-project-lite = "0.2.0"
+pin-project = "1"
+rustls = { version = "0.20.4", default-features = false }
+rustls-native-certs = { version = "0.6" }
 hyper-rustls = { version = "0.23", default-features = false, features = ["native-tokio", "http1", "tls12"] }
 hex = "0.4"
-hyper-multipart-rfc7578 = { git = "https://github.com/paullegranddc/rust-multipart-rfc7578.git", rev = "8dcedc266e50876c04c91d24390fe9ac44f10b96" }
+hyper-multipart-rfc7578 = "0.7.0"
 
 [dev-dependencies]
 maplit = "1.0"