chore: update .mailmap and contributors list

Author: Planeshifter

.mailmap

@@ -88,6 +88,8 @@ Karthik Prakash <116057817+skoriop@users.noreply.github.com> skoriop
 
 # M
 
+Manvith M <148960168+manvith2003@users.noreply.github.com> Manvith
+
 Marcus Fantham <mfantham@users.noreply.github.com> Marcus
 
 Matt Cochrane <matthew.cochrane.eng@gmail.com> <mattisback@gmail.com>

CONTRIBUTORS

@@ -52,6 +52,7 @@ Krishnendu Das <86651039+itskdhere@users.noreply.github.com>
 Kshitij-Dale <152467202+Kshitij-Dale@users.noreply.github.com>
 Lovelin <100030865+lovelindhoni@users.noreply.github.com>
 Manik Sharma <maniksharma.rke@gmail.com>
+Manvith M <148960168+manvith2003@users.noreply.github.com>
 Marcus Fantham <mfantham@users.noreply.github.com>
 Matt Cochrane <matthew.cochrane.eng@gmail.com>
 Mihir Pandit <129577900+MSP20086@users.noreply.github.com>