Connector Generator: Implement dynamic evaluation of YAML parameters (using `$(...)` syntax)

Summary

This MR adds the following improvements to the connector generator:

• Any field of the YAML file can contain Python expressions enclosed in $(...) which get dynamically evaluated at run-time using the ASTevaluator (see MR !1009 (merged)).
• Each expression can refer to the YAML itself:
  • all entries of the parameter dictionary are valid symbol names
  • any value of the YAML spec can be accessed using dot-notation (e.g., body_size.x_offset)
• For the body_shape and rule_areas, all entries of the parameter dict are also known symbols, allowing more flexibility
• The doc_parameters field is dropped, parameters is used instead for the formatting of fp_name, fp_suffix, description, and tags

Note: this basically obsoletes features introduced in !926 (merged) (eval(...) and doc_parameters is removed, $(...) is allowed everywhere now. In case doc_parameters is still used in some of the YAMLs (as of now there is only samtec_hsec8.yaml and samtec_micromate.yaml), an deprecation exception is raised.

Example

To demonstrate the possibilities consider the following YAML:

AST_Test:
  library: 'Test'
  description: 'AST test'
  fp_name: 'ast_test-{num_pos:02d}-{mount_pad_angle:d}'
  fp_suffix: ''     # optional: defaults to ''
  source: '~'
  tags: 'test'
  parameters:
    mount_pad_offset: 3.7
    mount_pad_angle: 30
    mount_pad_radians : $(radians(mount_pad_angle))
  positions: [2, 3, 4]
  pad_pitch: $(sqrt(4))
  row_pitch: 0
  pads:
    size: [ 1.5, 2.5 ]
  body_size:
    x_offset: $((mount_pad_offset + mount_pads.pad_tr.size * cos(mount_pad_radians)) if (num_pos < 3) else 5.0)
    y: $(pads.size[1] + 2 * mount_pad_offset * sin(mount_pad_radians))
  first_pin:
    position: 'top'
    body_chamfer: 0.5
    marker:
      shape: 'triangle'
  mount_pads:
    pad_tr:
      center:
        x_offset: $(mount_pad_offset * cos(mount_pad_radians))
        y: $(mount_pad_offset * sin(mount_pad_radians))
      size: $(0.25 * mount_pad_offset)
      rotation: $(mount_pad_angle)

Requirements:

This MR requires !1009 (merged); once merged, the changes will exclusively relate to connector_generator.py and samtec_hsec8.yaml.