expose custom PVM settings in the standard json interface (#318)

Exposes the following PolkaVM specific options via the standard json
interface:
- Heap size
- Stack size
- Whether to emit source level debug information

Additionally it is now forbidden to specify those as CLI option in
standard JSON mode. They are bytecode altering options and having
multiple ways to specify them creates unnecessary room for confusion:
The standard JSON input description should be sufficient and succint for
reproducible builds.

Closes #290

---------

Signed-off-by: xermicus <bigcyrill@hotmail.com>

CHANGELOG.md

@@ -14,6 +14,8 @@ Supported `polkadot-sdk` rev: `2503.0.1`
 
 ### Added
 
+- Add the PolkaVM heap size, stack size and debug info CLI compiler options to the standard JSON settings. This makes the standard JSON input succint for reproducible builds.
+
 ### Changed
 
 - Supported `polkadot-sdk` version is now `2503.0.1`