chore(examples): add TransactionBuilder publish and upgrade example

[Alex6323]

Closes #228
Closes #229

[DaughterOfMars]

What about the bindings?

[Alex6323]

What about the bindings?

I realized during the Rust example that it's probably better for the end-user to merge the publish steps and upgrade steps respectively internally in the builder. This is because one step implies the next. At least that's my current understand. Please correct me if I am wrong.

[Alex6323]

I'm a bit late to the party, can you TL;DR if it would have been too annoying/repetitive to split the example in 2?

it would have been because in order to upgrade you need to make sure there's published package. So ... with 2 examples you have code duplication of publishing.