Add bookmarks support

[madchicken]

This PR aims to add support for bookmarks in transactions. It also collects bookmarks used in a routed manager and sends them when requesting a new routing table. The list of collected bookmarks is cleared up every time a READ operation returns no bookmarks (that should mean the state of the cluster is consistent).
The bookmarks are sent in the BEGIN message and retrieved from the COMMIT message.

Doubts

I read somewhere that the command HELLO can also contain bookmarks, but the documentation does not say a thing about it.

Bonus: While implementing this feature, I found a problem when getting a connection in a routed environment, caused by a synchronization problem between the manager and the thread fetching the routing table.

Changes

Transaction Handling Updates:

• Added a new Begin request type with associated metadata and builder pattern for constructing instances. (lib/src/bolt/request/begin.rs)
• Modified the Commit request type to include a CommitResponse that handles bookmarks. (lib/src/bolt/request/commit.rs) [1] [2] [3]
• Updated the Graph struct to support starting transactions with bookmarks and to handle bookmarks in query execution results. (lib/src/graph.rs) [1] [2] [3] [4] [5] [6]

Routing Mechanism Updates:

• Added a new Begin request type to the bolt/request/mod.rs module. (lib/src/bolt/request/mod.rs) [1] [2]
• Modified the Route request type to remove lifetime parameters and updated serialization logic. (lib/src/bolt/request/route.rs) [1] [2] [3] [4] [5] [6]

Miscellaneous:

• Introduced a Bookmark trait to standardize bookmark handling across different response types. (lib/src/bookmarks.rs)
• Updated the Connection struct to support the new Route request type without lifetime parameters. (lib/src/connection.rs)

[madchicken]

I see tests fail since they run without the unstable-bolt-protocol-impl-v2 feature (sorry, I didn't think about that). Do you want me to remove them?

[knutwalker]

You can run the test only when the feature is enabled, e.g.

neo4rs/lib/tests/result_summary.rs

Line 1 in afbe45d

#![cfg(feature = "unstable-result-summary")]

[madchicken]

I fixed the issue, but I had to run the new integration test under the feature unstable-bolt-protocol-impl-v2 while I see you created a specific feature for the summary (for example). Do you want a new feature for bookmarks?

[knutwalker]

No, it's fine. I think now I overdid it with the various unstable subfeatures, they should probably collapsed into the unstable-v1 feature instead of new ones being added.

[knutwalker]

Nice, this looks good.
One change it would like to make is to not have a signature change on the commit method when the unstable feature is not enabled.

[knutwalker]

Thanks 👍

[knutwalker]

Thanks for the PR, this looks great!