fix: 🐛 memory leak when LottieRenderer is created

[theashraf]

Context:
The background shape is destroyed only when it is owned by the canvas and the canvas is cleared or destroyed

Leaks report:

Process:         demo-player [20165]
Path:            /Users/USER/*/demo-player
Load Address:    0x1029d8000
Identifier:      demo-player
Version:         0
Code Type:       ARM64
Platform:        macOS
Parent Process:  leaks [20164]

Date/Time:       2025-01-11 22:59:19.593 +0700
Launch Time:     2025-01-11 22:59:06.200 +0700
OS Version:      macOS 14.5 (23F79)
Report Version:  7
Analysis Tool:   /Applications/Xcode.app/Contents/Developer/usr/bin/leaks
Analysis Tool Version:  Xcode 16.2 (16C5032a)

Physical footprint:         19.4M
Physical footprint (peak):  36.2M
Idle exit:                  untracked
----

leaks Report Version: 4.0, multi-line stacks
Process 20165: 196 nodes malloced for 15 KB
Process 20165: 3 leaks for 288 total leaked bytes.

STACK OF 1 INSTANCE OF 'ROOT CYCLE: <tvg::Shape>':
17  dyld                                  0x1925220e0 start + 2360
16  demo-player                           0x1029daaa4 main + 36
15  demo-player                           0x1029daca0 std::rt::lang_start::h75a238737c88dd58 + 84  rt.rs:194
14  demo-player                           0x102ae1770 std::rt::lang_start_internal::hacda2dedffd2edb4 + 1092
13  demo-player                           0x1029dacd4 std::rt::lang_start::_$u7b$$u7b$closure$u7d$$u7d$::hc2f6f33d619d76e3 + 28  rt.rs:195
12  demo-player                           0x1029db1c0 std::sys::backtrace::__rust_begin_short_backtrace::h8cba6c8ea14dda1e + 24  backtrace.rs:160
11  demo-player                           0x1029daae8 core::ops::function::FnOnce::call_once::h1d8b2a493de320fa + 20  function.rs:250
10  demo-player                           0x1029da374 demo_player::main::h313c68b1f303524b + 40  main.rs:8
9   demo-player                           0x102a1cb44 dotlottie_rs::dotlottie_player::DotLottiePlayer::new::hde37addf97951b61 + 32
8   demo-player                           0x102a1a844 dotlottie_rs::dotlottie_player::DotLottiePlayerContainer::new::h9d6de976900f60e3 + 36
7   demo-player                           0x102a18514 dotlottie_rs::dotlottie_player::DotLottieRuntime::new::h5352e0300c55ee1a + 132
6   demo-player                           0x1029db2c4 dotlottie_rs::dotlottie_player::DotLottieRuntime::with_renderer::h7791b0e8b5bf6c54 + 180
5   demo-player                           0x102a50e8c _$LT$dyn$u20$dotlottie_rs..lottie_renderer..LottieRenderer$GT$::new::h150b8af904f5c722 + 128
4   demo-player                           0x1029f9a30 _$LT$dotlottie_rs..lottie_renderer..thorvg..TvgShape$u20$as$u20$core..default..Default$GT$::default::hfca35332b0732286 + 12
3   demo-player                           0x102ba0774 tvg_shape_new + 20  tvgCapi.cpp:273
2   demo-player                           0x102b096fc tvg::Shape::gen() + 24  tvgShape.cpp:48
1   libc++abi.dylib                       0x192863bd4 operator new(unsigned long) + 32
0   libsystem_malloc.dylib                0x1926e4a68 _malloc_zone_malloc_instrumented_or_legacy + 148 
====
    3 (288 bytes) ROOT CYCLE: <tvg::Shape 0x14b8042d0> [48]
       1 (144 bytes) ROOT CYCLE: <malloc in tvg::Paint::Paint() 0x14b804300> [144]
          CYCLE BACK TO <tvg::Shape 0x14b8042d0> [48]
       1 (96 bytes) ROOT CYCLE: <malloc in tvg::Shape::gen() 0x14b804390> [96]
          CYCLE BACK TO <tvg::Shape 0x14b8042d0> [48]

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Latest commit: 5f0d0cd

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