Obtain exact time (real) when particles hit boundaries + test

[EyaDammak]

This PR is adding a new real attribute for the time called "time_scraped" in the buffer of the particles absorbed in the boundaries. This new attribute calculates the real time when the particle hits the embedded boundary at the exact point of contact.
The PIC iteration at which each particle was absorbed at the boundary remains saved as an integer but it is called now "step_scraped" rather than "timestamp".

Note 1: Note that the attributes are accessed in the Python function ts.get_particle() respectively by 'timeScraped' and 'stepScraped'. For the Python function buffer.get_particle_boundary_buffer(), the names remain 'time_scraped' and 'step_scraped'

Note 2: We changed how to read in the dictionary in the file Source/Python/Particles/PinnedMemoryParticleContainer.cpp

Note 3: It still needs to calculate the exact point of contact + exact time for the regular boundaries. The real time added for the regular boundaries is temporary

[EyaDammak]

Suggested change

	comp = part_container.comp_names
	return comp
	data_array = []
	if comp_name in part_container.real_comp_names:
	comp_idx = part_container.real_comp_names[com_name]
	... loop over tiles and append to `data_array`, calling `get_real_data`
	elif comp_name in part_container.int_comp_names:
	comp_idx = part_container.int_comp_names[com_name]
	... same thing but with `get_real_data`
	else:
	raise RuntimeError('Name %s not found' %comp_name)
	return data_array

[EyaDammak]

auto string_to_index_intcomp = buffer[i].getParticleiComps();
int step_scraped_index = string_to_index_intcomp.at('step_scraped');
auto string_to_index_realcomp = buffer[i].getParticleComps();
int time_scraped_index = string_to_index_realcomp.at('time_scraped');