[draft] Create operations server

[adam-singer]

Description

Please include a summary of the changes and the related issue. Please also
include relevant motivation and context.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please also list any relevant details for your test configuration

Checklist

• Updated documentation if needed
• Tests added/amended
• bazel test //... passes locally
• PR is contained in a single commit, using git amend see some docs

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This change is 

[CLAassistant]

All committers have signed the CLA.

[allada]

Reviewed 1 of 11 files at r1.
Reviewable status: 0 of 1 LGTMs obtained, and pending CI: Bazel Dev / ubuntu-22.04, asan / ubuntu-22.04, docker-compose-compiles-nativelink (20.04), docker-compose-compiles-nativelink (22.04), integration-tests (20.04), integration-tests (22.04), license/cla, macos-13, ubuntu-22.04, and 4 discussions need to be resolved

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nativelink-config/examples/filesystem_cas.json line 175 at r1 (raw file):

  }],
  "global": {
    "max_open_files": 65000

nit: We don't change ulimit, so we probably don't want to do this.

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nativelink-service/src/execution_server.rs line 50 at r1 (raw file):

use nativelink_scheduler::operations::{Operations as SchedulerOperations};

struct InstanceInfo {

nit: Needs renamed.

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nativelink-service/src/execution_server.rs line 200 at r1 (raw file):

    }

    pub fn into_service(self) -> Server<ExecutionServer> {

nit: Lets rename this while we are here.

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nativelink-service/src/execution_server.rs line 371 at r1 (raw file):

    async fn delete_operation(&self, request: Request<DeleteOperationRequest>) -> Result<Response<()>, Status> {
        unimplemented!()

nit: You'll want to return the Status of not implemented.