Create bounding box area calculation process

[LukeParky]

DESCRIPTION OF PR:

MVP work for #256 but not enough to close to issue.

Polygon work would be better.
Could not display the bounding box polygon.

@caseyli92 use your best judgement if its best to merge this PR or complete and merge the polygon PR, or both

Developer Checklist

• Make code change
• Update tests
  • Update / create new tests
  • Ensure these tests have the expected behaviour
  • Test locally and ensure tests are passing
• Update documentation
  • Readme
  • Docstrings
  • Comments
  • Wiki

Reviewer Checklist

• Check new code for code smells
• Check new tests
  • Ensure adequate coverage
  • Check for code smells within tests
• Check if documentation needs updating
  • Readme
  • Docstrings
  • Comments
  • Wiki

[caseyli92]

Looks good.

[caseyli92]

Suggested change

	def __init__(self) -> None:
	"""Define inputs and outputs of the WPS process, and assogm process handler."""
	# Create bounding box WPS inputs.
	inputs = [BoundingBoxInput('bboxin', 'box in', crss=['epsg:4326'])]
	# Create area WPS outputs.
	outputs = [LiteralOutput('area', 'Area', data_type='string')]
	# Initialise the process.
	super().__init__(
	self._handler,
	identifier='area',
	title="Calculate the area of the polygon.",
	inputs=inputs,
	outputs=outputs,
	)
	def __init__(self) -> None:
	"""Define inputs and outputs of the WPS process, and assogm process handler."""
	# Create bounding box WPS inputs
	inputs = [BoundingBoxInput('bboxin', 'box in', crss=['epsg:4326'])]
	# Create area WPS outputs
	outputs = [LiteralOutput('area', 'Area', data_type='string')]
	# Initialise the process
	super().__init__(
	self._handler,
	identifier='area',
	title="Calculate the area of the polygon.",
	inputs=inputs,
	outputs=outputs,
	)

Suggested change

	def __init__(self) -> None:
	"""Define inputs and outputs of the WPS process, and assogm process handler."""
	# Create bounding box WPS inputs.
	inputs = [BoundingBoxInput('bboxin', 'box in', crss=['epsg:4326'])]
	# Create area WPS outputs.
	outputs = [LiteralOutput('area', 'Area', data_type='string')]
	# Initialise the process.
	super().__init__(
	self._handler,
	identifier='area',
	title="Calculate the area of the polygon.",
	inputs=inputs,
	outputs=outputs,
	)
	def __init__(self) -> None:
	"""Define inputs and outputs of the WPS process, and assogm process handler."""
	# Create bounding box WPS inputs.
	inputs = [BoundingBoxInput('bboxin', 'box in', crss=['epsg:4326'])]
	# Create area WPS outputs.
	outputs = [LiteralOutput('area', 'Area', data_type='string')]
	# Initialise the process.
	super().__init__(
	self._handler,
	identifier='area',
	title="Calculate the area of the polygon.",
	inputs=inputs,
	outputs=outputs,
	)

[caseyli92]

Suggested change

	@staticmethod
	def _handler(request: WPSRequest, response: ExecuteResponse) -> None:
	def _handler(self, request: WPSRequest, response: ExecuteResponse) -> None: