Add getTotalBufferedBytes() method fo AsyncTransport

Summary:
When BufferCallback::onEgressBuffered() is called, applications usually want to
know how many bytes were buffered so that can take actions (such as avoiding
that connection, failing fast, etc).
This diff adds getTotalPendingBytes() to AsyncTransport to allow applications
to easily query how many bytes were actually buffered.

Reviewed By: spalamarchuk

Differential Revision: D13252677

fbshipit-source-id: 8ec203f6764e00f52d471321afb549376397eb84

Bump version to 38:0

Fix possible move eval issue

Summary: Some static analysis tools/linters complained about eval order and doing std::move.  Also complained about shadowing the keepAlive var.  Fix both.

Reviewed By: andreazevedo

Differential Revision: D8287675

fbshipit-source-id: ee20b7c2afe9bb79b835fb4b3e6ca09cc2b0042d

Bump version to 37:0

Allow using EagerShardSelectionRoute with LatestRoute

Summary: Add support for nesting LatestRoute in EagerShardSelectionRoute.

Reviewed By: glamtechie

Differential Revision: D6832737

fbshipit-source-id: 94f8f7d9b78d76d470e19923c2ccb23f16c94a7d

Bump version to 36:0

Log failure to dump configs less frequently

Summary: It's not necessary to log every single failure to dump last valid configs.

Reviewed By: jmswen

Differential Revision: D4711040

fbshipit-source-id: 774f2659213dcdfe23ef927092397f2b1e71cc5e

Improve TLS ticket key generation

Summary: Improve the way AsyncMcServer generates TLS ticket keys.

Reviewed By: glamtechie

Differential Revision: D4565521

fbshipit-source-id: 7391c76d2af64bf583b38721c7a38f406f66a469

Template Proxy by RouterInfo

Summary:
Templating Proxy by RouterInfo.
Everything that proxy depends on should be also templated.
Things that depends on Proxy are still not templated/ready.

Reviewed By: jmswen

Differential Revision: D4230941

fbshipit-source-id: 9e95bfc2f05278263c191559da4857f5806b50d6

Refactor proxy stats

Summary:
Moving proxy stats to a separate class to better improve encapsulation and
facilitate removing dependencies on Proxy.

Reviewed By: jmswen

Differential Revision: D4068381

fbshipit-source-id: dec2277168d964bb05fee2c0232086069d9b744e