[WIP] Add FastThaiG2P

[wannaphong]

What do these changes do

Add FastThaiG2P to PyThaiNLP

GitHub: https://github.com/cstorm125/FastThaiG2P

report: https://arxiv.org/abs/2608.12814

Fixes #1484

Your checklist for this pull request

• Passed code styles and structures
• Passed code linting checks and unit test

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wannaphong]

@bact I am not sure about SPDX head in pythainlp/transliterate/fastthaig2p.py.

# SPDX-FileCopyrightText: 2016-2026 PyThaiNLP Project
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: Apache-2.0

or

# SPDX-FileCopyrightText: 2026 Charin Polpanumas and Amazon Web Services
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: Apache-2.0

or not both?

[bact]

The format is correct.

For the copyright text, depends on what you like to have. It is also possible to have multiple lines of copyright text.