onnxruntime

[TensorRT EP] Enhance EP context configs in session options and provider options (#19154)

Several changes:

1. To align with other EPs' setting of EP context configs in session
options, for example [QNN
EP](https://github.com/microsoft/onnxruntime/pull/18877), EP context
configs for TRT EP can be configured through:
1. Session Options: `ep.context_enable`, `ep.context_file_path` and
`ep.context_embed_mode`
2. Provider Options: `trt_dump_ep_context_model`,
`trt_ep_context_file_path` and `trt_dump_ep_context_embed_mode`
3. Above setting has 1:1 mapping and provider options has higher
priority over session options.
    
```
    Please note that there are rules for using following context model related provider options:

     1. In the case of dumping the context model and loading the context model,
        for security reason, TRT EP doesn't allow the "ep_cache_context" node attribute of EP context node to be
        the absolute path or relative path that is outside of context model directory.
        It means engine cache needs to be in the same directory or sub-directory of context model.

     2. In the case of dumping the context model, the engine cache path will be changed to the relative path of context model directory.
        For example:
        If "trt_dump_ep_context_model" is enabled and "trt_engine_cache_enable" is enabled,
           if "trt_ep_context_file_path" is "./context_model_dir",
           - if "trt_engine_cache_path" is "" -> the engine cache will be saved to "./context_model_dir"
           - if "trt_engine_cache_path" is "engine_dir" -> the engine cache will be saved to "./context_model_dir/engine_dir"
```    

2. User can decide the naming of the dumped "EP context" model by using
`trt_ep_context_file_path`, please see GetCtxModelPath() for more
details.

3. Added suggested comments from
https://github.com/microsoft/onnxruntime/pull/18217