feat: Support ordering LogEvent's

[giantcow]

Fixes #40

The tests aren't great, but they work

# kayo @ ClockTower in ~/workspace/tracing-cloudwatch on git:ordering x [19:08:06] 
$ cargo test
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
     Running unittests src/lib.rs (target/debug/deps/tracing_cloudwatch-420ac1eb2f0a2867)

running 3 tests
test export::tests::does_not_order_logs_by_default ... ok
test layer::tests::format ... ok
test layer::tests::with_fmt_layer_json ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s

   Doc-tests tracing_cloudwatch

running 2 tests
test src/lib.rs - (line 11) ... ignored
test src/lib.rs - (line 37) ... ignored

test result: ok. 0 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out; finished in 0.00s


# kayo @ ClockTower in ~/workspace/tracing-cloudwatch on git:ordering x [19:09:09] 
$ cargo test --features ordered_logs
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
     Running unittests src/lib.rs (target/debug/deps/tracing_cloudwatch-b9d2b1e831be7a41)

running 3 tests
test export::tests::ordering::orders_logs_when_enabled ... ok
test layer::tests::format ... ok
test layer::tests::with_fmt_layer_json ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s

   Doc-tests tracing_cloudwatch

running 2 tests
test src/lib.rs - (line 11) ... ignored
test src/lib.rs - (line 37) ... ignored

test result: ok. 0 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out; finished in 0.00s

[ymgyt]

Thank you for PR.
I'm planning to release it as version 0.3.0.

Since we format Cargo.toml with cargo-sort, please try running cargo sort.

[giantcow]

Interesting.. I assume that CI check is new? the change after running sort isn't related to my change:

diff --git a/Cargo.toml b/Cargo.toml
index 2124886..51d21ba 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,6 +35,7 @@ tracing-subscriber = { version = "0.3", default-features = false, features = [
 
 [dev-dependencies]
 aws-config = "1"
+insta = "1.40.0"
 tokio = { version = "1.28.0", features = [
   "rt",
   "rt-multi-thread",
@@ -43,4 +44,3 @@ tokio = { version = "1.28.0", features = [
 ] }
 tracing = "0.1.37"
 tracing-subscriber = { version = "0.3.17", features = ["json"] }
-insta = "1.40.0"

[ymgyt]

I'm sorry for asking you to make changes in areas unrelated to PR

[giantcow]

That's okay! No worries