refactor: simplified invoke syntax

[baszalmstra]

Refactors the invoke syntax of a runtime to be simpler and with less magic.

Previously calling a mun function looked like:

let runtime_ref = runtime.borrow();
let arg: i64 = invoke_fn!(runtime_ref, "arg", a, b).unwrap();

WIth this MR this becomes:

let runtime_ref = runtime.borrow();
let arg: i64 = runtime_ref.invoke("arg", (a,b)).unwrap();

Arguments are passed in as a single tuple. No more macros. A single entry point to call functions which is also properly suggested by language servers and the like. And the code became much simpler. The only downside is that calling a function with a single argument requires a bit of strange rust syntax: (a,). Note the comma. Without it, the parentheses are seen as an expression instead of a tuple declaration.

[codecov]

Codecov Report

Merging #347 (80610c0) into main (5953a7b) will decrease coverage by 0.10%.
The diff coverage is 71.42%.

❗ Current head 80610c0 differs from pull request most recent head dd358f1. Consider uploading reports for the commit dd358f1 to get more accurate results

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
- Coverage   80.21%   80.11%   -0.11%     
==========================================
  Files         262      261       -1     
  Lines       15667    15703      +36     
==========================================
+ Hits        12567    12580      +13     
- Misses       3100     3123      +23     

Impacted Files	Coverage Δ
crates/mun/src/ops/start.rs	0.00% <0.00%> (ø)
crates/mun_runtime/src/adt.rs	76.00% <ø> (ø)
crates/mun_runtime/src/lib.rs	66.82% <58.33%> (-4.52%)	⬇️
crates/mun/tests/integration.rs	100.00% <100.00%> (ø)
crates/mun_runtime/tests/marshalling.rs	98.27% <100.00%> (+0.06%)	⬆️
crates/mun_runtime/tests/memory.rs	100.00% <100.00%> (ø)
crates/mun_runtime/tests/runtime.rs	100.00% <100.00%> (ø)
crates/mun_skeptic/src/runtime.rs	88.00% <100.00%> (ø)

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