Add DoShaping Option

[gerdus]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules :cop:.
• [x] I have provided test coverage for my change (where applicable)

Description

Add option to TextOptions to skip shaping since it's a large percentage of the text layout. In my case it increased the FPS of my text stress test from a middling 6 FPS to an incredible 10 FPS, the hot path now being almost completely rending. Feel free to reject if you don't think it would be useful or would complicate support.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86%. Comparing base (91405e3) to head (ca9ed62). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #399 +/- ## ===================================== Coverage 86% 86% ===================================== Files 238 239 +1 Lines 15255 15264 +9 Branches 2108 2109 +1 ===================================== + Hits 13234 13243 +9 Misses 1550 1550 Partials 471 471 ``` | [Flag](https://app.codecov.io/gh/SixLabors/Fonts/pull/399/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SixLabors) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/SixLabors/Fonts/pull/399/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SixLabors) | `86% <100%> (+<1%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SixLabors#carryforward-flags-in-the-pull-request-comment) to find out more.

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