Can't use `requestCustomGrant` function as a promise

[janithRS]

Describe the issue:
Can't use requestCustomGrant function as a promise (as mentioned in the documentation with then) because according to the code it seems to be a void function.

How to reproduce:
Try to use then and catch with requestCustomGrant as mentioned in the doc.

Expected behavior:
Compiler errors appear.

Environment information (Please complete the following information; remove any unnecessary fields) :

• Product Version: [e.g., IS 5.10.0, IS 5.9.0]
• OS: [e.g., Windows, Linux, Mac]
• Database: [e.g., MySQL, H2]
• Userstore: [e.g., LDAP, JDBC]

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[pavinduLakshan]

requestCustomGrant function is no longer be exposed through the React SDK and it will be accessible through the SPA SDK. Hence, transferring the issue to the SPA SDK repository.