feat: Implement ProtocolApprovalsManager

I decided to make ProtocolApprovalsManager public method sync not to propagate asynceness early on onto the rest of the code. If later we decide that it is better to have this async, it should be easier to make that change than the opposite one.

--- don't change below this line ---
ENG-4064 Took 24 minutes

Cargo.lock

@@ -30,6 +30,15 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "allocator-api2"
 version = "0.2.21"
@@ -49,6 +58,7 @@ dependencies = [
  "alloy-network",
  "alloy-provider",
  "alloy-rpc-client",
+ "alloy-rpc-types",
  "alloy-serde",
  "alloy-transport",
  "alloy-transport-http",
@@ -332,6 +342,18 @@ dependencies = [
  "wasmtimer",
 ]
 
+[[package]]
+name = "alloy-rpc-types"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eea9bf1abdd506f985a53533f5ac01296bcd6102c5e139bbc5d40bc468d2c916"
+dependencies = [
+ "alloy-primitives",
+ "alloy-rpc-types-eth",
+ "alloy-serde",
+ "serde",
+]
+
 [[package]]
 name = "alloy-rpc-types-eth"
 version = "0.5.4"
@@ -1247,6 +1269,12 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
 
+[[package]]
+name = "futures-timer"
+version = "3.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f288b0a4f20f9a56b5d1da57e2227c661b7b16168e2f72365f57b63326e29b24"
+
 [[package]]
 name = "futures-util"
 version = "0.3.31"
@@ -2260,12 +2288,41 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
 [[package]]
 name = "regex-syntax"
 version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
 
+[[package]]
+name = "relative-path"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
+
 [[package]]
 name = "reqwest"
 version = "0.12.12"
@@ -2326,6 +2383,36 @@ dependencies = [
  "rustc-hex",
 ]
 
+[[package]]
+name = "rstest"
+version = "0.24.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03e905296805ab93e13c1ec3a03f4b6c4f35e9498a3d5fa96dc626d22c03cd89"
+dependencies = [
+ "futures-timer",
+ "futures-util",
+ "rstest_macros",
+ "rustc_version 0.4.1",
+]
+
+[[package]]
+name = "rstest_macros"
+version = "0.24.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef0053bbffce09062bee4bcc499b0fbe7a57b879f1efe088d6d8d4c7adcdef9b"
+dependencies = [
+ "cfg-if",
+ "glob",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "relative-path",
+ "rustc_version 0.4.1",
+ "syn 2.0.96",
+ "unicode-ident",
+]
+
 [[package]]
 name = "ruint"
 version = "1.12.4"
@@ -3049,6 +3136,7 @@ dependencies = [
  "lazy_static",
  "num-bigint",
  "num-traits",
+ "rstest",
  "serde",
  "serde_json",
  "thiserror 1.0.69",