Rusoto and Lambda are incompatible

[gangliao]

Describe the bug

Rusoto rusoto/rusoto#1651 is no longer maintained. This week we discovered that the invoke() function call will trigger Lambda to report an error.

Playground with the following options: 
PlaygroundOpt { ops_type: "scatter_gather_ops", events: 1, concurrency: 1 }
FunctionConfiguration { code_sha_256: Some("hmeMoQgVDiRrwByw5XXZPaJtPXiGAC5N1B1Ugax/zes="), 
code_size: Some(1699478), dead_letter_config: None, description: Some(""), environment: None, 
file_system_configs: None, function_arn: Some("arn:aws:lambda:us-east-1:942368842860:function:flock_pg_scatter"), 
function_name: Some("flock_pg_scatter"), handler: Some("handler"), image_config_response: None, kms_key_arn: None, 
last_modified: Some("2021-11-30T20:35:46.341+0000"), last_update_status: None, last_update_status_reason: None, 
last_update_status_reason_code: None, layers: None, master_arn: None, memory_size: Some(128), package_type: Some("Zip"),
 revision_id: Some("4561f1a1-579d-4b2f-bc11-a254838fea94"), role: Some("arn:aws:iam::942368842860:role/flock"), 
runtime: Some("provided.al2"), signing_job_arn: None, signing_profile_version_arn: None, state: Some("Pending"), 
state_reason: Some("The function is being created."), state_reason_code: Some("Creating"), timeout: Some(3), 
tracing_config: Some(TracingConfigResponse { mode: Some("PassThrough") }), version: Some("$LATEST"), vpc_config: None }
Error: Execution("Lambda function execution failure: The operation cannot be performed at this time. 
The function is currently in the following state: Pending")

Rusoto's invoke() will always assume that the lambda function is pending, which makes our project unable to continue. I use the AWS CLI to directly call the invoke() without any problems. Therefore, we must immediately abandon the Rusoto dependency library.

Let's try to use the official AWS SDK for Rust https://github.com/awslabs/aws-sdk-rust.

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[gangliao]

This is related to the 'delete_function()' issue. We may replace 'update_function_code()' for it.