fluvio dependency consistency

[pinkforest]

Re: discussion

• Add initial nats source connector #2 (comment)

Might want to update these too that point to git as well that I followed:

• mqtt-connector - git commit ref
• sql-connector - git commit ref
• http - uses tag instead commit
• kafka - uses git commit ref

It's not just cdk generate it's in every connector like that thus worth asking :]

Also cdk generate today uses git ref:

$ cdk generate foobar
Generating new Connector project: foobar
🤷   Please set a group name: yak
✔ 🤷   Which type of Connector would you like [source/sink]? · source
✔ 🤷   Will your Connector be public? · true
[1/8]   Done: .gitignore
[2/8]   Done: Cargo.toml
[3/8]   Done: Connector.toml
[4/8]   Done: README.md
[5/8]   Done: sample-config.yaml
[6/8]   Done: src/config.rs
[7/8]   Done: src/main.rs
[8/8]   Done: src

[foobar@localhost infinyon]$ grep fluvio foobar/Cargo.toml
 
fluvio = { git = "https://github.com/infinyon/fluvio", rev = "f9238646dd1b5197977b9c03feba39a78ef89bb8" }
fluvio-connector-common = { git = "https://github.com/infinyon/fluvio", rev = "f9238646dd1b5197977b9c03feba39a78ef89bb8", features = ["derive"]}

ref in fluvio:

• [Bug]: cdk generate project template should refer to fluvio stable release infinyon/fluvio#3785