svg_text: Addition of a 'text' element
In omsvg: Build and Transform 'SVG' Objects

The svg_text() function adds text to an svg object. As with many of the functions that create shape elements (such as svg_rect()), the starting position is defined by x and y values. All point positions are in units of px.

svg_text(
  svg,
  x,
  y,
  text,
  fill = NULL,
  opacity = NULL,
  path = NULL,
  attrs = list(),
  anims = list(),
  filters = list(),
  id = NULL
)

`svg`	The `svg` object that is created using the `SVG()` function.
`x, y`	The `x` and `y` positions of the upper left of the text to be drawn. The `x` and `y` values are relative to upper left of the SVG drawing area itself.
`text`	A character vector that contains the text to be rendered.
`fill`	The color of the text.
`opacity`	The opacity of the element. Must be a value in the range of `0` to `1`.
`path`	A single-length character vector that holds the formatted path string.
`attrs`	A presentation attribute list. The helper function `svg_attrs_pres()` can help us easily generate this named list object. For the most part, the list's names are the presentation attribute names and the corresponding values are the matching attribute values.
`anims`	An animation directive list for the element. This should be structured using the `anims()` function.
`filters`	A filter directive list for the element. This is easily created by using a list of `filter_*()` functions (e.g., `list(filter_gaussian_blur(2), filter_drop_shadow(2, 2))`).
`id`	An optional ID value to give to the built tag. This is useful for modifying this element in a later function call or for interacting with CSS.