RUST-1681 Add deserialize_object_id_from_hex_string

[sunsided]

This implements RUST-1681 bson::serde_helpers::deserialize_object_id_from_hex_string (#418).

I rearranged the already existing serialize_object_id_as_hex_string function into a object_id_as_hex_string module similar to the way hex_string_as_object_id was implemented.

[abr-egn]

Thank you for the contribution! This looks excellent, I've authorized the evergreen run and once that comes back green I'll merge this in 🙂

[abr-egn]

It looks like there are a few clippy and rustfmt errors:

[2023/07/10 16:09:35.146] error: unused import: `Serialize`
[2023/07/10 16:09:35.146]  --> src/serde_helpers.rs:5:18
[2023/07/10 16:09:35.146]   |
[2023/07/10 16:09:35.146] 5 | use serde::{ser, Serialize, Serializer};
[2023/07/10 16:09:35.146]   |                  ^^^^^^^^^
[2023/07/10 16:09:35.146]   |
[2023/07/10 16:09:35.146]   = note: `-D unused-imports` implied by `-D warnings`
[2023/07/10 16:09:35.146] error: unused import: `crate::oid::ObjectId`
[2023/07/10 16:09:35.146]  --> src/serde_helpers.rs:7:5
[2023/07/10 16:09:35.146]   |
[2023/07/10 16:09:35.146] 7 | use crate::oid::ObjectId;
[2023/07/10 16:09:35.146]   |     ^^^^^^^^^^^^^^^^^^^^

[2023/07/10 16:08:32.329] Diff in /data/mci/0bb5ee567d6e491fa6826df19cb4fd7e/src/src/serde_helpers.rs at line 23:
[2023/07/10 16:08:32.329]      serialize as serialize_hex_string_as_object_id,
[2023/07/10 16:08:32.329]  };
[2023/07/10 16:08:32.329]  #[doc(inline)]
[2023/07/10 16:08:32.330] -pub use object_id_as_hex_string::{
[2023/07/10 16:08:32.330] -    deserialize as deserialize_object_id_from_hex_string,
[2023/07/10 16:08:32.330] -    serialize as serialize_object_id_as_hex_string,
[2023/07/10 16:08:32.330] -};
[2023/07/10 16:08:32.330] -#[doc(inline)]
[2023/07/10 16:08:32.330]  pub use i64_as_bson_datetime::{
[2023/07/10 16:08:32.330]      deserialize as deserialize_i64_from_bson_datetime,
[2023/07/10 16:08:32.330]      serialize as serialize_i64_as_bson_datetime,
[2023/07/10 16:08:32.330] Diff in /data/mci/0bb5ee567d6e491fa6826df19cb4fd7e/src/src/serde_helpers.rs at line 34:
[2023/07/10 16:08:32.330] +};
[2023/07/10 16:08:32.330] +#[doc(inline)]
[2023/07/10 16:08:32.330] +pub use object_id_as_hex_string::{
[2023/07/10 16:08:32.330] +    deserialize as deserialize_object_id_from_hex_string,
[2023/07/10 16:08:32.330] +    serialize as serialize_object_id_as_hex_string,
[2023/07/10 16:08:32.330]  };
[2023/07/10 16:08:32.330]  #[doc(inline)]
[2023/07/10 16:08:32.330]  pub use rfc3339_string_as_bson_datetime::{

Once those are fixed it'll be good to merge!

[abr-egn]

Again, we appreciate the contribution, but it turns out that this isn't actually needed :)