[PROPOSAL] Update MAINTAINERS.md

[dblock]

Is your feature request related to a problem?

Eyeballing the metrics and the contents of https://github.com/opensearch-project/index-management/blob/main/MAINTAINERS.md a number of folks have not been active for a while.

What solution would you like?

Move those who are no longer actively maintaining this repo to Emeritus.

Please comment if you're still actively maintaining this repo, and I can move the rest to Emeritus in 1 PR.

[vikasvb90]

Actively Maintaining!

[AWSHurneyt]

I am not actively maintaining this plugin, or the ISM dashboards plugin.

[amsiglan]

I am not actively maintaining this plugin, or the ISM dashboards plugin.

[lezzago]

I am not actively maintaining this plugin, or the ISM dashboards plugin.

[sbcd90]

I am not actively maintaining this plugin, or the ISM dashboards plugin.

[getsaurabh02]

Here is the data from last 6 months for contributions (PR + Issues)

<style> </style>

user_login.keyword: Descending	GitHub contributions ( Issues + pull requests )
harshitakaushik-dev	6
sarthakaggarwal97	6
bowenlan-amzn	4
cwperks	3
DarshitChanpura	2
r1walz	2
aggarwalShivani	1
dblock	1
ikibo	1
mohitamg	1
nisgoel-amazon	1
rayshrey	1
skumarp7	1
soosinha	1
varun-lodaya	1
vikasvb90	1

[xluo-aws]

Please remove me from the list. Thanks

[praveensameneni]

I am not actively supporting Index Management. Please move to emeritus

[getsaurabh02]

I am not actively maintaining Index Management, other than admin, release and generic triage tasks. Thanks

[jowg-amazon]

I am not actively maintaining this plugin, or the ISM dashboards plugin.