feat: Asset references, world.get_asset and world.has_asset bindings

[aggyomfg]

Hello, thanks for your creation! BMS is very useful engine!

This PR Potentially close #479

New Asset Reference Type: Added ReflectBase::Asset(UntypedHandle, ComponentId)
Asset Creation Functions: Added ReflectReference::new_asset_ref() and ReflectBaseType::new_asset_base()

Added two new world functions:
get_asset(handle_reference, registration) - Retrieves an asset by handle
has_asset(handle_reference) - Checks if an asset exists

Tests, Docs + but didnt get what else needed, please ask.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/testing_crates/script_integration_test_harness/src/test_functions.rs	17% smaller
crates/testing_crates/test_utils/src/test_data.rs	1% smaller
assets/tests/asset_operations/asset_operations.lua	0% smaller
assets/tests/asset_operations/asset_operations.rhai	Unsupported file format
crates/bevy_mod_scripting_bindings/src/access_map.rs	0% smaller
crates/bevy_mod_scripting_bindings/src/reference.rs	0% smaller
crates/bevy_mod_scripting_display/Cargo.toml	Unsupported file format
crates/bevy_mod_scripting_display/src/impls/bevy_asset.rs	0% smaller
crates/bevy_mod_scripting_display/src/impls/mod.rs	0% smaller
crates/bevy_mod_scripting_functions/src/core.rs	0% smaller
docs/src/SUMMARY.md	Unsupported file format
docs/src/ScriptingReference/asset-operations.md	Unsupported file format

[github-actions]

Bencher Report

Branch	asset_operations
Testbed	linux-gha

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Benchmark	Latency	nanoseconds (ns)
component/access Lua	📈 view plot ⚠️ NO THRESHOLD	3,516.80 ns
component/access Rhai	📈 view plot ⚠️ NO THRESHOLD	5,537.90 ns
component/get Lua	📈 view plot ⚠️ NO THRESHOLD	2,122.10 ns
component/get Rhai	📈 view plot ⚠️ NO THRESHOLD	4,233.40 ns
conversions/Mut::from	📈 view plot ⚠️ NO THRESHOLD	89.18 ns
conversions/Ref::from	📈 view plot ⚠️ NO THRESHOLD	84.83 ns
conversions/ScriptValue::List	📈 view plot ⚠️ NO THRESHOLD	360.85 ns
conversions/ScriptValue::Map	📈 view plot ⚠️ NO THRESHOLD	992.36 ns
conversions/ScriptValue::Reference::from_into	📈 view plot ⚠️ NO THRESHOLD	28.79 ns
conversions/Val::from_into	📈 view plot ⚠️ NO THRESHOLD	267.19 ns
function/call 4 args Lua	📈 view plot ⚠️ NO THRESHOLD	1,636.20 ns
function/call 4 args Rhai	📈 view plot ⚠️ NO THRESHOLD	1,325.20 ns
function/call Lua	📈 view plot ⚠️ NO THRESHOLD	219.69 ns
function/call Rhai	📈 view plot ⚠️ NO THRESHOLD	420.61 ns
loading/empty Lua	📈 view plot ⚠️ NO THRESHOLD	862.87 ns
loading/empty Rhai	📈 view plot ⚠️ NO THRESHOLD	856.14 ns
math/vec mat ops Lua	📈 view plot ⚠️ NO THRESHOLD	6,942.80 ns
math/vec mat ops Rhai	📈 view plot ⚠️ NO THRESHOLD	6,203.10 ns
query/10 entities Lua	📈 view plot ⚠️ NO THRESHOLD	18,757.00 ns
query/10 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	19,001.00 ns
query/100 entities Lua	📈 view plot ⚠️ NO THRESHOLD	38,303.00 ns
query/100 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	31,055.00 ns
query/1000 entities Lua	📈 view plot ⚠️ NO THRESHOLD	240,040.00 ns
query/1000 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	158,400.00 ns
reflection/10 Lua	📈 view plot ⚠️ NO THRESHOLD	5,741.40 ns
reflection/10 Rhai	📈 view plot ⚠️ NO THRESHOLD	15,362.00 ns
reflection/100 Lua	📈 view plot ⚠️ NO THRESHOLD	48,861.00 ns
reflection/100 Rhai	📈 view plot ⚠️ NO THRESHOLD	718,500.00 ns
resource/access Lua	📈 view plot ⚠️ NO THRESHOLD	3,307.30 ns
resource/access Rhai	📈 view plot ⚠️ NO THRESHOLD	5,011.60 ns
resource/get Lua	📈 view plot ⚠️ NO THRESHOLD	2,055.00 ns
resource/get Rhai	📈 view plot ⚠️ NO THRESHOLD	3,752.80 ns

🐰 View full continuous benchmarking report in Bencher

[makspll]

Nice work, much appreciated! @aggyomfg