Introduce function versioning

[thomasgouveia]

This PR brings the following improvements and fixes :

• Function are now versioned using semantic versioning. That means that you can build and invoke multiple versions of a specific function.
• Client SDKs are updated to match the new APIs
• Fix the DeleteFunctionInstance function signature
• Remove deprecated code for LZ4 compression

See #10 for more details.

Closes #10

How to test ?

Run a classic Morty instance on this branch. Please note that I wasn't able to test the PR with a previous state (e.g: updating an existing morty instance). If you can test this, its great !

Prerequisites

• Morty CLI using the branch Update commands to be able to version function cli#8

Steps

Create a new function with the CLI :

morty fn init -r go-1.19 my-versioned-function

Build it :

morty fn build my-versioned-function

Invoke it (by default, if you don't specify a version with the --version flag, the latest version will be invoked):

morty fn invoke my-versioned-function
# Expected output 
{"message": "Hello, World!"}

Now, update the code of your function to return another message, for example "Hello from my new version". Bump the version in the morty.yaml file to v0.1.1, and re-build your function :

morty fn build my-versioned-function

Once done, invoke the new version :

morty fn invoke my-versioned-function --version v0.1.1 # You can omit the version to ensure that the latest is called
# Expected output
{"message": "Hello from my new version"}

Ensure that you can also invoke the previous version :

morty fn invoke my-versioned-function --version v0.1.0
# Expected output
{"message": "Hello, World!"}