chore: Fix the compilation of the benchmarks outside of the workspace root

The workspace root enables some features which are required to compile
the benchmarks, but if you decide to just compile the benchmarks these
features won't be enabled since they aren't specified in the Cargo.toml
file of the benchmarks.

Let's define all the required features so compilation works in both
cases.

Author: poljar

benchmarks/Cargo.toml

@@ -13,7 +13,7 @@ matrix-sdk-base = { workspace = true }
 matrix-sdk-crypto = { workspace = true }
 matrix-sdk-sqlite = { workspace = true, features = ["crypto-store"] }
 matrix-sdk-test = { workspace = true }
-matrix-sdk = { workspace = true }
+matrix-sdk = { workspace = true, features = ["native-tls", "e2e-encryption", "sqlite"] }
 ruma = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }